We've pushed out updates to PDFExaminer and Cryptam command line versions tonight that include Yara scanning capability, unlike running the standard Yara tool, using our Yara plugin in PDFExaminer and Cryptam allow you to look deeper inside document files.
read more........http://blog.malwaretracker.com/2013/02/yara-scanning-added-to-command-line.html?spref=tw