The problem is that links with anchors, on conversion to PDF, often end up with the “#” symbol converted to “%23”. This will, of course, break the link.
Fixing the problem manually
You can, of course, manually edit such a link in Acrobat to change the “%23” back to a “#” character. To do so, activate the Link tool, right-click the link in question, select Properties, Actions, Edit, and then edit the link in the Edit URL dialogue box.
However, this could be a time-consuming operation for documents containing many such links.
Fixing the problem at source
To avoid the problem altogether, when converting from Word to PDF:
- Click File, Save As
- In the Save As dialogue box, from the Save as type dropdown, select PDF
Be sure to select the Standard “Optimize for” option (if “Minimum size” is selected, the PDF will be created without any tags).
Click the Save button. Links with anchors will then be exported correctly.
Lastly, the caveat mentioned above is that this method may cause Unicode/font embedding problems if you want to subsequently convert the PDF to PDF/A format.