[okular] [Bug 444297] New: Okular "Could not open" a certain PDF, with no other details

[Wolfgang Faust]

https://bugs.kde.org/show_bug.cgi?id=444297

            Bug ID: 444297
           Summary: Okular "Could not open" a certain PDF, with no other
                    details
           Product: okular
           Version: 21.08.2
          Platform: Neon Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: okular-devel at kde.org
          Reporter: wolfgangmcq+acct-bugs.kde.org at gmail.com
  Target Milestone: ---

SUMMARY

I have what I believe is a valid PDF document (at any rate, `gs` can show it
just fine). When I open it in Okular, I get an error dialog box that says
"Could not open file:///path/to/document.pdf." (obviously with the actual path
in it), and no hints as to what might have gone wrong. 

STEPS TO REPRODUCE
1. Open a certain PDF. (I *think* the problem is something to do with it having
a digital signature; it’s a PDF I downloaded from DocuSign and that’s the error
I got from another program I tried opening it with.)

OBSERVED RESULT
"Could not open file:///path/to/document.pdf."

The only output when opened in a terminal is:

    Unable to open QuickAnnotatingTools XML definition

which also appears when I open a PDF that works fine, so I don’t think it’s
related.

EXPECTED RESULT
The PDF opens, or, barring that, some information on what could be wrong.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: KDE Neon 5.23, on Ubuntu 20.04 Focal
KDE Plasma Version: 5.23.1
KDE Frameworks Version: 5.87.0
Qt Version: 5.15.3

ADDITIONAL INFORMATION

Possibly related: Bug 321483, from 2013, regarding a similarly unhelpful
message when opening a PPT file (except that has output on stderr).

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