Avira issues a warning about polymorphous harmful PDFs this is the URL adress if you want to read this info ;Dhttp://www.avira.com/en/security_news/polymorphous_harmful_pdfs.html
Seems an exploit of Adobe Reader 8.1.1 or older… Update your Adobe Reader installation
sorry i didnt use the auto direct link this is the link ;D http://www.avira.com/en/security_news/polymorphous_harmful_pdfs.html
i don t use the bloated adobe reader i use foxit reader which is a small and fast against adobe