Trend Micro FP TROJ_PIDIEF.YNLO - pdf files

Some versions of Trend Micro are giving a False Positive TROJ_PIDIEF.YNLO on pdf files.

In case you are using Trend Micro, read the thread at the Trend Micro forum at which a Trend Micro employee already posted a reply:
TROJ_PIDIEF.YNLO false positives?
http://community.trendmicro.com/t5/OfficeScan/TROJ-PIDIEF-YNLO-false-positives/td-p/162157

With thanks to the folks at DSLR where there is this thread:
*** Warning to Trend Micro Business Security Users ***
http://www.dslreports.com/forum/r29439959-Warning-to-Trend-Micro-Business-Security-Users-