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Apple's 'Preview' PDF viewer has lots of security vulnerabilities. Simple fuzzing will quickly find plenty of 0day.

That's a bold claim waiting to be backed up.

I think the poster was referring to Charlie Miller's CSW 2010 presentation, where he finds a number of trivial, exploitable vulnerabilities in Preview. You can see the slide deck here: http://securityevaluators.com/files/slides/cmiller_CSW_2010....