VBA to password protect pdf document

Hey all,
I need to execute javascript from my VBA code that will password protect my PDF file. I am currently using the method below:
AForm.Fields.ExecuteThisJavaScript password_js
where password_js is a variable with the javascript code in it. I have executed other javascript this way (adding text to the pdf) and it works fine.
The javascript I am trying is from http://www.evermap.com/javascriptsecurity.asp and works fine when run from within acrobat but it's not working through VBA. One thing I noticed is that when run from acrobat a save dialog pops up but through VBA nothing happens at all..

Anyone know a simple way to do this? The password will be the same each time it is used - currently it is applied using the action wizard in acrobat but if I can run it via VBA after exporting the file to PDF it would be very nice!
Thanks,
Josh

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