Security firm iDefense warns that a flaw in Adobe Systems' Reader 6.x and Acrobat Reader 5.x could be exploited via a malicious Web site to execute arbitrary code. According to iDefense's advisory, the vulnerability is caused by a boundary error in the "pdf.ocx" ActiveX component supplied with Adobe Acrobat Reader.
"This can be exploited via a malicious Web site using a specially crafted URL to potentially execute arbitrary code," iDefense said. Other versions may also be affected. As a workaround, iDefense recommends users change Adobe Acrobat/Acrobat Reader settings to prevent PDFs from automatically opening when accessed by a Web browser.
"When prompted, first save the file to disk before opening, thereby closing the exploitation vector described," the advisory said.
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.