With the new JailbreakMe.com method of jailbreak released, it seems that some people are already in the process of figuring out how it works. Once the exploitation method is disclosed to the public (it’s related to PDF handling), black hat hackers would be able to easily set up their own websites that load their own malicious PDFs that they crafted to do something like steal your address book or text message database. In a pre-emptive attempt to combat this, BGR has been informed that a plugin named “PDF Loading Warner” has been created, which will hooks into the system and displays a warning before a PDF can be displayed.
If you install this plugin and navigate to a website that should not be showing a PDF and get this warning, then you are able to click “Cancel” and the system will block the PDF from loading and subsequently stealing your data. It should be available from Cydia in the next day or two we hear, or more experienced users can grab the .deb file here and install it manually via SSH or iFile.