Welcome! If it "doesn't run" does it throw an error? Try:
#!/usr/bin/perl
use strict;
use warnings;
use CAM::PDF;
my $file_name="test.pdf";
my $pdf = CAM::PDF->new($file_name);
my $pageone_tree = $pdf->getPageContentTree(1); # replaced 4 with 1 fo
+r testing
$pageone_tree->render("CAM::PDF::Renderer::Dump");
Note the last line, it's directly taken from the CAM::PDF::Renderer::Dump documentation. This prints the coordinates of each node of a page layout, your post suggests you want to read the content, investigate the other methods this module offers such as getPageContent. See also PerlMonks for the Absolute Beginner.
Update: removed typo from last sentence.
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