Welcome to the monestary!

First off, you need to put

use strict;
use warnings;
[download]

at the top of your script. see strict and warnings for information on what these do. Basically it keeps you from making silly errors that we as developers tend to make. <edit>You'll need to run the script on the command line to see the errors produced. Or as matija said you can carp the fatals to your browser window.<edit>

Secondly, I don't know anything about Acrobat::FDF and I can't find it on CPAN, but I would wager it has some sort of error string to see if anything is going wrong there.

I don't see why it would be complaining about pre-mature end of script headers right now.... drop strict and warnings in and see if that sheds any light on it... repost your code once you have it working (back to it's current error msg) with strict and warnings pragma.

Hopefully you'll find some help in the above babbling.