Allow cve-2013-3881 to bypass reader sandbox

Hi @zeroSteiner,  this pull request just makes the filename not so generic, and allows the exploit to try to elevate the current process, if creating a notepad.exe process fail. 

While Protecting Mode on IE will allow you to create a process other sandboxes, like the reader one, won't allow you to create a new process. It's sad to lose a so awesome work :) since this kernel exploit will allow you to bypass sandbox on Reader :)

Hope it has sense for you! Feel free to check test and land and https://github.com/rapid7/metasploit-framework/pull/2957 will be automatically updated :)

thanks! awesome work! O_O