OpenX Ad Server version 2.8.10 was shipped with an obfuscated backdoor since at least November 2012 through August 2013. Exploitation is simple, requiring only a single request with a rot13'd and reversed payload.
PHP
php
To display the available options, load the module within the Metasploit console and run the commands 'show options' or 'show advanced':
Time is precious, so I don’t want to do something manually that I can automate. Leveraging the Metasploit Framework when automating any task keeps us from having to re-create the wheel as we can use the existing libraries and focus our efforts where it matters.
– Jim O’Gorman | President, Offensive Security