What’s JailbreakMe? It’s an easy way to jailbreak an Apple iOS device using a PDF (related) vulnerability.
It’s done with a “drive-by” style exploit.
All somebody needs to jailbreak their (newer) iPad/iPhone/iPod is to visit jailbreakme.com and to touch the free/install button. The German Federal Office for Information Security has issued a warning about this. They’re concerned about the potential for targeted malicious attacks using trojanized versions of the JailbreakMe exploit.