#!/usr/bin/perl
use PDF::API2;                                      
print "start ".(localtime)."\n";               
$pdf = PDF::API2->open("sample.pdf");           
$page = $pdf->openpage(1);
$page->mediabox(840,600)
$gfx=$page->gfx;
print "first image ".(localtime)."\n";          
$first=$pdf->image_png("first.png");
print "inserting first image ".(localtime)."\n";
$gfx->image($first,134,106,510,281);
print "saving ".(localtime)." \n";
$pdf->saveas('new_file.pdf');
print "done ".(localtime)." \n";

##</code><code>##

start Mon Jun  3 10:46:31 2013
first image Mon Jun  3 10:46:31 2013
inserting first image Mon Jun  3 10:46:53 2013
saving Mon Jun  3 10:46:53 2013
done Mon Jun  3 10:46:57 2013