This module exploits a vulnerability found in Synactis' PDF In-The-Box ActiveX component, specifically PDF_IN_1.ocx. When a long string of data is given to the ConnectToSynactis function, which is meant to be used for the ldCmdLine argument of a WinExec call, a strcpy routine can end up overwriting a TRegistry class pointer saved on the stack, resulting in arbitrary code execution under the context of the user. Also note that since the WinExec function is used to call the default browser, you must be aware that: 1) The default must be Internet Explorer, and 2) when the exploit runs, another browser will pop up. Synactis PDF In-The-Box is also used by other software such as Logic Print 2013, which is how the vulnerability was found and publicly disclosed.
To display the available options, load the module within the Metasploit console and run the commands 'show options' or 'show advanced':
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