PDF Vulnerability Exposed by JailbreakMe

The JailbreakMe website which allows users to have a browser-based jailbreak for their iOS devices is great for jailbreakers, but works because of a vulnerability in iOS: the iPhone automatically downloads PDF files, and the developer, Comex injected the jailbreak code into the FlateDecode stream section of the file. This is a clear problem for Apple and for non-jailbreakers. Why is it not a problem for jailbreakers? Well, once the device is jailbroken, you can patch the hole, to prevent malware from using theVISHAY INTERTECHNOLOGY VIRGIN MEDIA VIEWSONIC