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The big news this week in PDF is being made by several security vulnerabilities affecting Acrobat and Adobe Reader that could be used to hijack a user 's system . Installing the 7.0.9 patch released by Adobe will fix the problems , as will upgrading to version 8.x , which does not contain the vulnerabilities . It took me a few attempts to get my first free book as it would n't load in my Web browser . You even wish dancers good luck in French : actors say " break a leg " to wish one another good luck before a performance ; dancers say " merde . Planet PDF talks about the nature of the vulnerabilities and their current status . The good thing is it 's trivial to run big collections of PDFs through the optimization process - - both Acrobat and our Nitro PDF Professional do it . Over the last month or so , Adobe has been earning column inches for all the wrong reasons , with security experts uncovering several vulnerabilities . The most hyped of these vulnerabilities was covered last week in my editorial , along with the resulting panic running through parts of the security community .