http://www.idigitaltimes.com/articles/10421/20120725/mac-os-x-mountain-lion-release-malware.htm
Apple's Mac OS X 10.8 Mountain Lion Release Marred By Malware Alerts
Security firm Sophos has identified a piece of malware known as "Crisis and Morcut," which arrived under a file named "AdobeFlashPlayer.jar." The .jar file works the same as a .zip file, and when it's decompressed, it initiates files named "WebEnhancer," "Win," and "Mac." The WebEnhancer file triggers a digital signature that should alert most users to decline the application from running on your system.