Use PDF::API2: 
use PDF::API2;
my $newpdf = new PDF::API2;

my $oldpdf = PDF::API2->open($filename);

for my $pg (1 .. $oldpdf->pages) {
   my $img = $pdf->pdfimageobj( $oldpdf, $pg );

   my $page = $pdfnew->page();
   $page->mediabox( 6 * 72, 9 * 72); # There's 72 postscript points in
+ an inch

   my $gfx = $page->gfx;
   $gfx->pdfimage(
      $img, 
      0.5 * 72, # half inch from the left
      0.5 * 72, # half inch from the bottom
      5 / 8.5,   # x scale = new width / old width
      8 / 11    # y scale = new height / old height
   );
}

$pdf->saveas($newfilename);
$pdf->end();

[download]
(Code is untested but worked in my head. There shouldn't be much wrong with it. AFAIK, PDF::API2 will automatically embed any fonts it needs -- so long as it can find them)
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In reply to Re: PDF mod suggestions by BigLug
in thread PDF mod suggestions by blue.monk

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