I made a script that opens a pdf file

I haven't done a single thing with PDF that I can remember.  But if you show us the script you've written, I'd be glad to try giving it a shot, and there's probably dozens of other "PDF neophytes" who would as well.

So show us what you have.  Then someone may notice that you're not using the right module.  Or that you're calling a method with the wrong arguments.  Or that you've got a simple typographical error somewhere.  Or a myriad of other possibilities ...

Oh ... and welcome to Perlmonks!