First, you need to find out if the executable you are trying to install supports silent-mode installations. For example, some installation utilities allow you to do this:
Additionally, some installation utilities will allow you to provide a pre-configured answer file that automatically provides a response to certain prompts the installation file may have. For example (here, myanswers.mst is your answer file):
setup.exe /quiet /TRANSFORMS=myanswers.mst
In other words, you may need to first find from the vendor that provided you the installation executable to see if they support silent installations. Then, you can try to use those supported parameters via a LANDesk Software Distribution package.
A quick search of the Foxit Forums revealed this[ thread|http://www.foxitsoftware.com/bbs/showthread.php?t=706&highlight=silent+install]:
So you just need to create a simple batch file, package builder package, self extracting exe (with zipgenius or 7zip) or autoit script to dump the files to a folder of your choice and run foxitreader -register.