as this is not new i am 110% sure they are
New virus travels in PDF files (2001) http://news.cnet.com/2100-1001-271267.html
PDF Virus Demonstrated (2010) http://blogs.pcmag.com/securitywatch/2010/04/pdf_virus_demonstrated.php
Tips on Protecting Your Computer Network from PDF Viruses (2011) http://www.brighthub.com/computing/enterprise-security/articles/76970.aspx
her are some http://www.virustotal.com/file-scan/report.html?id=7b6b268cbca9d421aabba5f08533d3dcaba50e0f7887b07ef2bd66bf218b35ff-1303289192 http://www.virustotal.com/file-scan/report.html?id=737870d63386078cfc89459e4628ba8a0bf0cbb024019e6600a240da3e6dc9ef-1303800542