Apparently, PDF::API2 is for creating PDFs, it will read them, but a lot of the fields/records will just be binary junk ... which you can replace with various calls

What you're after is CAM::PDF/https://metacpan.org/pod/distribution/CAM-PDF/bin/pdfinfo.pl

$ pdfinfo Test-Results-Cookstove-Performance.pdf
File:         Test-Results-Cookstove-Performance.pdf
File Size:    16123625 bytes
Pages:        128
CreationDate: Thu Nov  3 01:02:54 2011
Creator:      Adobe Acrobat Pro 9.4.6
ModDate:      Thu Jan  5 00:52:01 2012
Producer:     Adobe PDF Library 9.9
Trapped:      False
Page Size:    variable
Optimized:    yes
PDF version:  1.7
Security
  Passwd:     none
  Print:      yes
  Modify:     yes
  Copy:       yes
  Add:        yes
[download]