Adobe Reader and Acrobat 6.0.4 and earlier, on Mac OSX, has insecure file and directory permissions, which allows local users to gain privileges by overwriting program files.
https://exchange.xforce.ibmcloud.com/vulnerabilities/27678
http://www.vupen.com/english/advisories/2006/2758
http://www.securityfocus.com/bid/18945
http://www.adobe.com/support/security/bulletins/apsb06-08.html