Adobe has issued a warning to its users in regard to what it termed a "serious vulnerability" that affects Windows, Mac and Unix users of Adobe's Acrobat Reader Software.
In the security advisory Adobe said "All currently supported shipping versions of Adobe Reader and Acrobat (Adobe Reader and Acrobat 9.1, 8.1.4, and 7.1.1 and earlier versions) are vulnerable to this issue."
Open Acrobat or Adobe Reader
Select "Edit" Preferences
Click OK and exit
In regard to other PDF readers and this particular vulnerability Graham Cluley of Sophos noted this on his blog, "As we predicted in the Sophos 2009 Security Threat Report, hackers are increasingly looking at commonly used browser plugins like Adobe Flash and PDF in their attempts to infect innocent computer users."
Cluley also noted that while it might be a temporary fix to switch to another PDF reader, "if everyone switched en masse to the same alternative to Adobe Reader, we'd all be in the same pickle again."
OK, so you want to stamp your document. Maybe you need to give reviewers some advice about the document's status or sensitivity. This tip from author Ted Padova demonstrates how to add stamps with the Stamp Tool along with related comments.