PDF files are one of the most common, and most trusted document formats out there. However, that trust, combined with the cross-platform use of PDFs makes the Adobe file format one of the most targeted and exploited by malicious attacks as well.
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Most of us don't like paying for antivirus (AV) software, but at least home users can rely on one of the free options, such as Microsoft Security Essentials, avast!, or AVG Free.
Security researchers have shown that carefully crafted text messages sent to cell phones via short message service (SMS) can cause them to shutdown without the knowledge of the owner.