According to this article there is a security hole in Adobe Reader that can be exploited to allow someone to execute code on your machine. The problem affects all versions of Adobe reader including 8.1.4, 9.1, 7.11 and earlier and Windows, Mac and Unix platforms can all be affected. Security experts are recommending that people disable Javascript in the application to help reduce the risk of the hole being exploited. You can disable JavaScript from the General Preferences dialog box but unchecking the Enable JavaScript function under the Edit Preferences option.

It can be really irritating when you want to edit a document but find you have lost the original word document and only have a PDF. Most of the time you can extract the text from a PDF but this can be time consuming and it often needs to be reformatted. I found a useful post on askowen the other day that deals with the problem and offers several possible free solutions. One of which involves filling in an online form at freepdfconvert which takes a couple of minutes. It does however, only support documents that are up to 2 pages long and also requires you to know the password if the PDF is password protected,