Open a PDF file with acroread (i.e.
http://www.wolle-hamburg.de/Bugs/acroread-5.06-r3/sample.pdf) and select "Edit/Find...".
Find what: Enter "Something". Click "Find".
The result is:
No occurrences of:
were found in the document.
Click "OK" and acroread is blown.
The same happens using original PDFs from Adobe:
this is an upstream problem ...
at the adobeforums a user reported it happening on Redhat, Mandrake, and Gentoo ...
basically it means theres nothing we can really do about it ;)
just sit back and wait for a new version to come out that resolves the problem
and we close it for now ...
oh and i filed a bug upstream about it