Find published / last changed date in files with metadata that can be viewed in the web browser (e.g. pdf)

[ndsvw]

For example, this pdf file http://www.seu1.org/files/level6/IT230/Book/(web.tech%201st%20book)%20Web%20Technologies%20-%20A%20Computer%20Science%20Perspective.pdf contains metadata...

pdfinfo give this output:

Creator:         Advanced PDF Repair at http://www.datanumen.com/apdfr/
Producer:        Advanced PDF Repair at http://www.datanumen.com/apdfr/; modified using iTextSharp 5.1.0 (c) 1T3XT BVBA
CreationDate:    Sun Oct 23 17:54:45 2011 CEST
ModDate:         Sat Feb 21 03:37:00 2015 CET
Custom Metadata: yes
Metadata Stream: yes
Tagged:          no
UserProperties:  no
Suspects:        no
Form:            AcroForm
JavaScript:      no
Pages:           591
Encrypted:       no
Page size:       252 x 333 pts
Page rot:        0
File size:       7055286 bytes
Optimized:       no
PDF version:     1.5