Malicious PDF files are increasingly used by hackers as a means of infecting your PC with malware, and they don't have to look far to find security holes in Adobe Reader. Every few months a new batch of problems are discovered, and just last week Adobe released a patch to cover 29 vulnerabilities with Reader and Acrobat. Is it finally safe to view PDF files, then? Almost certainly not, as the format is packed with powerful and largely unnecessary features that have the potential for abuse. The only way to improve your Adobe Reader security is to turn them off: here's what you need to do. Launch Adobe Reader and click Edit > Preferences. Choose the JavaScript section, and clear "Enable JavaScript". This may break some "intelligent" PDF files, for example those that display a slideshow of images, but it'll also close the single biggest Adobe Reader security hole. If you only change one setting, make it this one. Click the General section and enable "Use only certified plug-ins" to make Adobe Reader more careful about its add-ons. Click Forms. Adobe Reader has an auto-complete feature that will remember form entries you've typed and prompt you with them in future. It's a neat way to save time, but also a security risk, as the program could save all kinds of personal details that are then accessible to others. Set "Auto-Complete" to Off to protect yourself. Click Multimedia Trust. Adobe Reader can launch audio and video files, a problem if they use an exploit of your own. If you generally only read text-based PDF files then clear "Allow multimedia operations", select Other documents, and clear "Allow multimedia operations" again. Click Security, and check the "Verify signatures when the document is opened" option to have signed documents properly checked. Then click Advanced Preferences, select the Windows Integration tab, and ensure all the options there are clear to check those documents with maximum thoroughness. Select the Security (Enhanced) section and check "Enable Enhanced Security" to prevent scripts from unknown sources from ever being downloaded. Browse to the Trust Manager section. Did you know that PDF files can contain attachments of other file types, which can then be launched automatically? Just as with multimedia files, this allows a PDF document to be the carrier for another file that will try to exploit a security hole on your PC. Clear "Allow opening of non-PDF file attachments…" to turn this off, and then click Change Settings. PDF files are also able to connect to the web to share information. This is typically used if you're filling in a form, say, and it's sending the information back to the form's creator, but it could also be used maliciously. Adobe deal with this by asking for your permission before letting the PDF file connect to the web, but if you don't require this feature anyway then it's better to turn it off. Select "Block all web sites" and click OK. Finally, choose the Updater section. We would recommend you select "Automatically install updates" to make sure that future security patches are installed just as soon as they arrive. That's it, you're done. These changes will break a few of the more "advanced" PDF files, especially PDF forms, but if you generally only read text-based PDF documents then you're unlikely to notice any difference. And by way of compensation your PC is now much more secure - there's far less chance of your system being compromised by a malicious PDF file in future.

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