Cross-site scripting (XSS) vulnerability in Jelsoft vBulletin 3.5.4 and 3.6.0 allows remote attackers to inject arbitrary web script or HTML by uploading an attachment with a .pdf extension that contains JavaScript, which is processed as script by Microsoft Internet Explorer 6.
https://exchange.xforce.ibmcloud.com/vulnerabilities/28239
http://www.securityfocus.com/bid/19334
http://www.securityfocus.com/archive/1/442488/100/200/threaded
http://archives.neohapsis.com/archives/bugtraq/2006-08/0074.html