diff --git a/sfx2/UIConfig_sfx.mk b/sfx2/UIConfig_sfx.mk
index 554bf63785ed..3d182da9c27a 100644
--- a/sfx2/UIConfig_sfx.mk
+++ b/sfx2/UIConfig_sfx.mk
@@ -20,6 +20,7 @@ $(eval $(call gb_UIConfig_add_uifiles,sfx,\
 	sfx2/uiconfig/ui/documentfontspage \
 	sfx2/uiconfig/ui/documentinfopage \
 	sfx2/uiconfig/ui/documentpropertiesdialog \
+	sfx2/uiconfig/ui/editdocumentdialog \
 	sfx2/uiconfig/ui/editdurationdialog \
 	sfx2/uiconfig/ui/emojicontrol \
 	sfx2/uiconfig/ui/errorfindemaildialog \
diff --git a/sfx2/source/view/viewfrm.cxx b/sfx2/source/view/viewfrm.cxx
index 660e0d5fe0a9..3586a9ac3559 100644
--- a/sfx2/source/view/viewfrm.cxx
+++ b/sfx2/source/view/viewfrm.cxx
@@ -154,6 +154,55 @@ void SfxViewFrame::InitInterface_Impl()
 #endif
 }
 
+/// Asks the user if editing a read-only document is really wanted.
+class SfxEditDocumentDialog : public MessageDialog
+{
+private:
+    VclPtr<PushButton> m_pEditDocument;
+    VclPtr<PushButton> m_pCancel;
+
+public:
+    SfxEditDocumentDialog(vcl::Window* pParent);
+    ~SfxEditDocumentDialog() override;
+    void dispose() override;
+};
+
+SfxEditDocumentDialog::SfxEditDocumentDialog(vcl::Window* pParent)
+    : MessageDialog(pParent, "EditDocumentDialog", "sfx/ui/editdocumentdialog.ui")
+{
+    get(m_pEditDocument, "edit");
+    get(m_pCancel, "cancel");
+}
+
+SfxEditDocumentDialog::~SfxEditDocumentDialog()
+{
+    disposeOnce();
+}
+
+void SfxEditDocumentDialog::dispose()
+{
+    m_pEditDocument.clear();
+    m_pCancel.clear();
+    MessageDialog::dispose();
+}
+
+/// Is this read-only object shell opened via .uno:SignPDF?
+static bool IsSignPDF(SfxObjectShellRef xObjSh)
+{
+    if (!xObjSh.Is())
+        return false;
+
+    SfxMedium* pMedium = xObjSh->GetMedium();
+    if (pMedium && !pMedium->IsOriginallyReadOnly())
+    {
+        std::shared_ptr<const SfxFilter> pFilter = pMedium->GetFilter();
+        if (pFilter && pFilter->GetName() == "draw_pdf_import")
+            return true;
+    }
+
+    return false;
+}
+
 static bool AskPasswordToModify_Impl( const uno::Reference< task::XInteractionHandler >& xHandler, const OUString& aPath, const std::shared_ptr<const SfxFilter>& pFilter, sal_uInt32 nPasswordHash, const uno::Sequence< beans::PropertyValue >& aInfo )
 {
     // TODO/LATER: In future the info should replace the direct hash completely
@@ -1149,13 +1198,7 @@ void SfxViewFrame::Notify( SfxBroadcaster& /*rBC*/, const SfxHint& rHint )
                 }
                 else
                 {
-                    bool bSignPDF = false;
-                    SfxMedium* pMedium = m_xObjSh->GetMedium();
-                    if (pMedium && !pMedium->IsOriginallyReadOnly())
-                    {
-                        std::shared_ptr<const SfxFilter> pFilter = pMedium->GetFilter();
-                        bSignPDF = pFilter && pFilter->GetName() == "draw_pdf_import";
-                    }
+                    bool bSignPDF = IsSignPDF(m_xObjSh);
 
                     SfxInfoBarWindow* pInfoBar = AppendInfoBar("readonly", SfxResId(bSignPDF ? STR_READONLY_PDF : STR_READONLY_DOCUMENT));
                     if (pInfoBar)
@@ -1267,6 +1310,12 @@ void SfxViewFrame::Notify( SfxBroadcaster& /*rBC*/, const SfxHint& rHint )
 
 IMPL_LINK_NOARG(SfxViewFrame, SwitchReadOnlyHandler, Button*, void)
 {
+    if (m_xObjSh.Is() && IsSignPDF(m_xObjSh))
+    {
+        ScopedVclPtrInstance<SfxEditDocumentDialog> pDialog(nullptr);
+        if (pDialog->Execute() != RET_OK)
+            return;
+    }
     GetDispatcher()->Execute(SID_EDITDOC);
 }
 
diff --git a/sfx2/uiconfig/ui/editdocumentdialog.ui b/sfx2/uiconfig/ui/editdocumentdialog.ui
new file mode 100644
index 000000000000..bfaccd927322
--- /dev/null
+++ b/sfx2/uiconfig/ui/editdocumentdialog.ui
@@ -0,0 +1,73 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- Generated with glade 3.18.3 -->
+<interface>
+  <requires lib="gtk+" version="3.0"/>
+  <object class="GtkMessageDialog" id="EditDocumentDialog">
+    <property name="can_focus">False</property>
+    <property name="border_width">6</property>
+    <property name="title" translatable="yes">Confirm editing of document</property>
+    <property name="resizable">False</property>
+    <property name="modal">True</property>
+    <property name="type_hint">dialog</property>
+    <property name="skip_taskbar_hint">True</property>
+    <property name="message_type">question</property>
+    <property name="text" translatable="yes">Are you sure you want to edit the document?</property>
+    <property name="secondary_text" translatable="yes">The original file can be signed without editing the document. Existing signatures on the document will be lost in case of saving an edited version.</property>
+    <child internal-child="vbox">
+      <object class="GtkBox" id="messagedialog-vbox">
+        <property name="can_focus">False</property>
+        <property name="orientation">vertical</property>
+        <property name="spacing">12</property>
+        <child internal-child="action_area">
+          <object class="GtkButtonBox" id="messagedialog-action_area">
+            <property name="can_focus">False</property>
+            <property name="layout_style">end</property>
+            <child>
+              <object class="GtkButton" id="edit">
+                <property name="label" translatable="yes">Edit Document</property>
+                <property name="visible">True</property>
+                <property name="can_focus">True</property>
+                <property name="can_default">True</property>
+                <property name="has_default">True</property>
+                <property name="receives_default">True</property>
+                <property name="use_underline">True</property>
+              </object>
+              <packing>
+                <property name="expand">False</property>
+                <property name="fill">True</property>
+                <property name="position">0</property>
+                <property name="non_homogeneous">True</property>
+              </packing>
+            </child>
+            <child>
+              <object class="GtkButton" id="cancel">
+                <property name="label" translatable="yes">Cancel</property>
+                <property name="visible">True</property>
+                <property name="can_focus">True</property>
+                <property name="receives_default">True</property>
+                <property name="use_underline">True</property>
+                <property name="image_position">bottom</property>
+              </object>
+              <packing>
+                <property name="expand">False</property>
+                <property name="fill">True</property>
+                <property name="position">1</property>
+                <property name="non_homogeneous">True</property>
+              </packing>
+            </child>
+          </object>
+          <packing>
+            <property name="expand">False</property>
+            <property name="fill">True</property>
+            <property name="pack_type">end</property>
+            <property name="position">0</property>
+          </packing>
+        </child>
+      </object>
+    </child>
+    <action-widgets>
+      <action-widget response="1">edit</action-widget>
+      <action-widget response="0">cancel</action-widget>
+    </action-widgets>
+  </object>
+</interface>