There doesn't appear to be a way to stop Okular from notifying (with a little yellow bar at the top of a PDF page) about attachments contained in a PDF document. "General" → "Show hints and info messages" does not work as expected in this case. ( http://docs.kde.org/stable/en/kdegraphics/okular/configgeneral.html ) cf. https://forum.kde.org/viewtopic.php?f=251&t=118086
Git commit 4d6c7ad5e3d8e69167820feeb3230d9107885edc by Albert Astals Cid. Committed on 12/12/2013 at 22:44. Pushed by aacid into branch 'KDE/4.12'. Don't show the attachment bar if showOSD is disabled FIXED-IN: 4.12.1 M +1 -1 part.cpp http://commits.kde.org/okular/4d6c7ad5e3d8e69167820feeb3230d9107885edc