...from Office 2008 - remains an issue with some older versions of Office. The inadvertent transfer of PC-specific malwarevia non-Windows platforms - a phenomenon we sometimes refer to as heterogeneous malware transmission - is still a risk...
http://www.computerweekly.com/Articles/2008/07/08/231396/macs-and-malware.htm
...great success," he added. Google’s team also reported that on average 2% of malicious websites were delivering malwarevia advertising. “This report reconfirms Finjan’s Q1 2007 trend report regarding malicious Ads being served on legitimate...
http://www.itbinternet.com/pr/18715