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Demaestro - 9:59 pm on Aug 4, 2010 (gmt 0)
[mashable.com...]
whenever a user loads a PDF document, it has to load the fonts associated with it. A font can be inserted into the PDF containing a program that will cause a stack overflow. The result is that the program can pass the iPhone’s security defenses and then break out of its protective sandbox
Be cautious about any PDFs you open on your Idevices