There has been a bugfix release after 5.2.0 that is easy to get via renaming the ebuild to 5.2.1. Unfortunately however, the zip is not on sourceforge anymore, I downloaded it manually elsewhere.
Got it from here: https://code.google.com/p/java-doc-manager/downloads/detail?name=itext-5.2.1.zip&can=2&q=
It does not feel acceptable to me to get the zip from a third party; instead, we should push to the much newer version 5.4.1 or newer, see the duplicate bug. *** This bug has been marked as a duplicate of bug 475552 ***