Public bug reported:

Certain PDFs such as

  https://www.cl.cam.ac.uk/downloads/ring/ring-2014-05.pdf

render in ghostscript 9.22~dfsg+1-0ubuntu1.1 (as found on a fresh Ubuntu
18.04.1 LTS install) with almost all characters replaced by either
random characters or empty rectangles. Same problem in gv.

The same PDFs render correctly on older Ghostscript versions (e.g.,
Ghostscript 9.18 from Ubuntu 16.04), as well as with other PDF viewers
(e.g., evince, okular, acroread). The PDFs pass the Adobe Acrobat
"preflight" checks.

How to reproduce (X11 required):

$ wget https://www.cl.cam.ac.uk/downloads/ring/ring-2014-05.pdf
$ gs -dSAFER ring-2014-05.pdf

Expected behaviour: Journal title (big font, top of page 1) should read
"The Ring"

Actual behaviour: Journal title (big font, top of page 1) reads "7KH
5LQJ"

There are no error or warning messages.

[A very similar PDF (same fonts, just produced by a different Adobe InDesign / 
PDF Library version) that does not exhibit this problem is e.g. 
https://www.cl.cam.ac.uk/downloads/ring/ring-2014-01.pdf
and other example files can be found in the same https directory. ]

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ghostscript 9.22~dfsg+1-0ubuntu1.1
ProcVersionSignature: Ubuntu 4.15.0-33.36-generic 4.15.18
Uname: Linux 4.15.0-33-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
CurrentDesktop: XFCE
Date: Wed Sep  5 17:25:56 2018
InstallationDate: Installed on 2018-04-27 (131 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
SourcePackage: ghostscript
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: ghostscript (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic

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https://bugs.launchpad.net/bugs/1790908

Title:
  Ghostscript 9.22 garbles characters when rendering certain PDFs

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