Have you tried the PDF suite to determine the page orientation?
use PDF::Parse;
use Data::Dumper;

my $pdf->TargetFile($filename);
$pdf->LoadPageInfo;

my @size = $pdf->PageSize;
my $rotation = $pdf->PageRotation;

print Dumper(\@size);
print Dumper($rotation);

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In reply to Re: Determining a PDF's orientation by Roger
in thread Determining a PDF's orientation by friedo

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