Adobe has released critical patches for Adobe Reader and Acrobat and Adobe Flash in order to offset "critical security vulnerabilities," in the earlier versions.
Adobe noted, "Adobe recommends users of Adobe Flash Player 9.x and 10.x and earlier versions update to Adobe Flash Player 126.96.36.199 and 10.0.32.18. Adobe recommends users of Adobe AIR version 1.5.1 and earlier versions update to Adobe AIR 1.5.2. Adobe recommends users of Adobe Reader 9 and Acrobat 9 and earlier versions update to Adobe Reader 9.1.3 and Acrobat 9.1.3."
You can also download the Adobe patches via the links within the advisory bulletin. Adobe also noted that the updated versions of both Acrobat and Reader address the critical patch and also provide more stability.
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.