Add OSVDB-93754: Synactis PDF In-The-Box ConnectToSynactic Stack Buffer Overflow

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, and results in arbitrary code execution under the
context of the user.
Remove whitespace
Fix different landings
Updates description about default browser setting
Change to AverageRanking

Just to play with the firing order for Browser Autopwn, this one
should fire as late as possible.
Land #1916, @wchen-r7's exploit for Synactics PDF