[okular] [Bug 424779] New: Embedded links not recognised in PDF file

[Leonov65]

https://bugs.kde.org/show_bug.cgi?id=424779

            Bug ID: 424779
           Summary: Embedded links not recognised in PDF file
           Product: okular
           Version: 1.10.3
          Platform: Flatpak
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: PDF backend
          Assignee: okular-devel at kde.org
          Reporter: forums.kdebug at tapetum.eml.cc
  Target Milestone: ---

Created attachment 130474
  --> https://bugs.kde.org/attachment.cgi?id=130474&action=edit
PDF file with bad hyperlinks

SUMMARY
Embedded hyperlinks in PDF received from reputable source not recognised.

STEPS TO REPRODUCE
1. Open problematic PDF.
2. When scrolling with browse tool hand does not change to pointed finger over
hyperlink.
3. 

OBSERVED RESULT
Links operate same as ordinary text of document. They look like a hyperlink
(highlighted contrasting colour, underlined) but do not work like one.
Cannot copy link location. Cannot click link and have it open in browser.

EXPECTED RESULT
To be able to copy link location or open link in browser.


SOFTWARE/OS VERSIONS

Linux/Ubuntu 18.04
Qt Version: 
Okular Flatpak 1.10.3 installed with all necessary resource platforms
2020-07-28.

ADDITIONAL INFORMATION
Same behaviour seen with other open source viewers:
-Evince 3.28.4-0ubuntu1.2 amd64 
-qpdfview 0.4.18.99~2106~64~ubuntu18.04.1
-xpdf 3.04-7 amd64
-Okular 1.3.3 (4:17.12.3-0ubuntu1)

Hyperlinks in problematic PDF file work normally using:
-Firefox 78.0.2 incorporated PDF viewer
-Foxit Reader free 2.4.4.0911
-Master PDF Editor 5.5.38

"pdfinfo" command gave the following information about the file.
Note errors in report. Note creator and producer.

$ pdfinfo 20200724.pdf
Title:          SSSS
Subject:        TTTT
Author:         RRRR
Creator:        Acrobat PDFMaker 20 for Word
Producer:       Adobe PDF Library 20.9.95
CreationDate:   Tue Jun 23 12:09:43 2020 AEST
ModDate:        Tue Jun 23 12:09:46 2020 AEST
Tagged:         yes
UserProperties: no
Suspects:       no
Form:           none
Syntax Error: Invalid object stream
Internal Error: xref num 730 not found but needed, try to reconstruct<0a>
JavaScript:     no
Pages:          6
Encrypted:      no
Page size:      595.32 x 841.92 pts (A4)
Page rot:       0
File size:      443527 bytes
Optimized:      yes
PDF version:    1.4

Below is a pdfinfo report from PDF file published December 2019 by same entity.
Links function as expected in this file. Note creator and producer.

$ pdfinfo 20191219.pdf
Title:          PPPP
Subject:        QQQQ
Author:         RRRR
Creator:        Acrobat PDFMaker 19 for Word
Producer:       Adobe PDF Library 19.21.90
CreationDate:   Wed Dec 18 18:14:47 2019 AEDT
ModDate:        Thu Dec 19 13:20:11 2019 AEDT
Tagged:         yes
UserProperties: no
Suspects:       no
Form:           AcroForm
JavaScript:     no
Pages:          11
Encrypted:      no
Page size:      595.32 x 841.92 pts (A4)
Page rot:       0
File size:      2404379 bytes
Optimized:      no
PDF version:    1.4


Have seen problem in only one PDF file but same behaviour is repeated across
several open source document viewers. Did not know where else to report
possible bug.

Thank you for your interest.

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