Fair enough comment and could point to the problem.
CAM::PDF was last updated a decade ago; PDF::API2 was last updated a few months ago.
When the OP sorts out the API::PDF2 installation problem, something like this might be a better way to go:
#!/usr/bin/env perl
use strict;
use warnings;
use PDF::API2;
my $src = PDF::API2->open('DX.pdf');
my $pdf = PDF::API2::->new();
for my $page_num (2 .. $src->page_count() - 1) {
$pdf->import_page($src, $page_num, $page_num - 1);
}
$pdf->save('DXout2.pdf');
I did a visual check of "DXout2.pdf":
it looks the same as "DXout.pdf" but is substantially larger.
$ ls -al
...
-rw-r--r-- 1 ken None 3855 Mar 25 09:10 DX.pdf
-rw-r--r-- 1 ken None 3277 Mar 25 09:42 DXout.pdf
-rw-r--r-- 1 ken None 5525 Mar 25 10:46 DXout2.pdf
...
If the OP chooses that route,
an improvement on my simplistic solution may be worth investigating.
Edit (fixed typo): s/API::PDF2/PDF::API2/
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