Even though Germany took the step of issuing a security warning regarding the new PDF vulnerability in iOS, Apple has not yet released a patch for this serious problem. The ironic thing is that there is a patch available... if your device is "jailbroken".
I find it interesting that if you want your device to be secure you have to remove the "security" features to do it. It's also interesting that Apple seems to be taking its time to address this issue (since there's obviously a working fix that was developed externally for jailbroken phones.)
If you've got an iOS device, I'd recommend steering clear of PDFs until a patch is released!