Symantec Security Response has discovered an Adobe Acrobat PDF file circulating the internet which allows a hacker to take over a user's PC.
Symantec said, "This vulnerability is not one we have seen in the wild before and affects Adobe Flash. The authors have taken a bug and turned it into an exploit. Once the unsuspecting user visits the website or opens the PDF, this exploit will allow further malware to be dropped on the victim's machine and possibly open a back door."
Symantec predicted that there will be more attacks that attempt to exploit this vulnerability. Once the patch is available from Adobe, users can update their systems. As an extra safety measure, Vista users can employ the UAC (User Account Control) feature as this will help mitigate a successful compromise, Symantec said.