My guess, and it is a guess as I've not linked to pdf files so far, that it is a similar problem to linking to .wmv files. You are actually launching an external application and htaccess is interpreting the request from Acrobat as a type-in request. If my guess is correct, you'll probably need to drop a cookie 1st then have htaccess test for the cookie's existance before the surfer can load the pdf document(s).
Then again, I could be completely full of shit...
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