If I correctly understand what you're asking, I think you're comparing apples and oranges. A quick scan through the PDF you gave the link to didn't show any graphics, but all text.
If you're trying to get the text out of the PDF you should look at the PDF modules on CPAN or take advantage of a service that Adobe offers to translate PDF files to text files. Then you could use Perl to do whatever you want with the data.
Of course if you're trying to open a PDF as a binary file, the other monks have got you started in the right direction.
Good luck!
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