I downloaded a user manual for an Airport Extreme from the Apple support site and the ClamXav sentry that scans my downloads detected Exploit.PDF-19944. It most likely is a false positive but I thought I would ask others opinions about this. Follow this link (http://support.apple.com/manuals/#airport) to the Airport Extreme manuals and then download the PDF for the "Airport Extreme (802.11n) Setup Guide." This pic shows the specific manual to download and the prompt from ClamXav Sentry. It is a Windows specific malware. Kind of funny that it is hosted on the Apple support site.