These are sites with generally non-offensive content, but that also have potentially objectionable content such as adult or pornographic material. Content on these sites is usually unorganized and highly dynamic, making more precise classification of specific images difficult. The number of sites in this category grew by approximately 50 percent in 2009 as more people wished to share their multimedia content in an unregulated way. And while more traditional attacks leveraged these sites as a temporary home, the vulnerabilities in Adobe products in 2009 elevated the number of attacks on these sites.
Malware has to live somewhere. And while some Web filtering solutions can detect known malware hosts, most malware hides in sites that are otherwise benign. According to a report from Blue Coat Systems, the five most commonly compromised Web sites range from online storage to -- surprise -- adult content. Click through this slideshow for more information.