• Super Search this site for prior references to some or all of your pdf terms
• Big G: site:cpan.org pdf (and related) just for starter; brain-freeze on search cpan for all pdf modules
• ppm:

   1: Acme-PDF-rescale 0.2
   2: CAM-PDF 1.60
   3: CAM-PDF-Annot 0.06
   4: CAM-PDF-Annot-Parsed 0.01
   5: PDF 111
   6: PDF-API2 2.020
   7: PDF-API3 3.001
   8: PDF-Boxer 0.004
   9: PDF-EasyPDF 0_04
  10: PDF-Extract 3.04b
  11: PDF-FromImage 0.000003
  12: PDF-Imposition 0.03
  13: PDF-Labels 0.01
  14: PDF-Report 1.36
  15: PDF-Report-Table 1.01
  16: PDF-ReportWriter 1.5
  17: PDF-Reuse 0.35
  18: PDF-Reuse-OverlayChart 0.03
  19: PDF-Reuse-Tutorial 0.11
  20: PDF-Table 0.9.6_h3
  21: PDF-Writer 0.06
  22: PDF-Xtract 0.08
  23: PDFREP 2.20
  24: Pod-Pdf 1.2
  25: Template-Flute-PDF 0.0042
  26: Test-PDF 0.01
  27: Text-PDF 0.29a
  28: WebService-Trynt-PDF 0.01
  29: Wx-PdfDocument 0.13
  30: perl-pdf 0.06.1b-SREZIC-3
  31: pod2pdf 0.42

... and read the docs. Perhaps some of these approaches will be helpful.