Security researcher, Petko Petkov, says he's discovered a flaw in the Adobe PDF file format that could allow a Windows PC to be "Completely!!! Invisibly and unwillingly!!!," compromised. Petkov, who also recently discovered a vulnerability in QuickTime that affected the Firefox browser says " All it takes is to open a PDF document or stumble across a page which embeds one." He has stated that he would not release code that shows how this attack works until Adobe addresses the problem. InfoWorld has the story here.