There are so many reasons why you should download the most up-to-date version of Adobe Reader X, and one of those is to stop PDF spam attacks. It does not take long to check for an update, and will save you so much hassle in the long run. The latest such attack is known as Mal/PDFEx-J, which SophosLabs recently detected.
Naked Security has more details on this, as well as a few example screenshots of what you are likely to see. The website decided to take a sample of an offending piece of malware to give you an idea of what to expect, which they then opened up with numerous versions of Adobe reader.
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Adobe Reader 8 did try to open the file, but did try to download as well as run the code from what was said to be a Colombian TLD. We are sure that people with more experience with this sort of thing will know what that means. We cannot stress how important it is to have Adobe Reader X, as this latest software did not suffer any such attack.
There was an error message, which you can see for yourself on the Naked Security website. Knowing that the latest version of Adobe Reader was able to stop this attack surly has to be reason enough to download it now.
You can get the latest version of Adobe Reader X here, you are advised that you might have to pause your antivirus software why it download and installs. Have you been a victim of the attack mentioned above?