To add a bit of background: the IETF (standards body for the Internet)
decided to change the format of their newly published standards from
ASCII text to XML. From this XML both HTML and PDF versions are
generated (and a text version which may omit diagrams / pictures). The
PDF version cannot be read on Ubuntu 18.04 with default configuration,
because the default document viewer evince crashes when opening the
file.

** Summary changed:

- evince crashes (segmentation fault) when opening file rfc8655.pdf
+ evince crashes (segmentation fault) when opening file rfc8655.pdf and other 
new-format Internet standards

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https://bugs.launchpad.net/bugs/1849888

Title:
  evince crashes (segmentation fault) when opening file rfc8655.pdf and
  other new-format Internet standards

Status in evince package in Ubuntu:
  New

Bug description:
  When trying to display the PDF file rfc8655.pdf from
  https://tools.ietf.org/pdf/rfc8655.pdf evince crashes:

      $ evince rfc8655.pdf 
      Segmentation fault (core dumped)

  I would have expected the PDF file to be displayed.  Instead, evince
  crashed and did not display the document.

  The built-in PDF renderer of Firefox 70.0 does display the PDF
  correctly.

  Since the segmentation fault hints at a memory management error
  triggered by external input this may have security implications.  I
  did not investigate this any further.  I do not set the "This bug is a
  security vulnerability" flag because I do not know if it really is (it
  probably is, but I have no proof) and I do not want this bug report to
  be private.

  $ lsb_release -rd
  Description:    Ubuntu 18.04.3 LTS
  Release:        18.04

  $ apt-cache policy evince
  evince:
    Installed: 3.28.4-0ubuntu1.2
    Candidate: 3.28.4-0ubuntu1.2
    Version table:
   *** 3.28.4-0ubuntu1.2 500
          500 http://de.archive.ubuntu.com/ubuntu bionic-updates/main amd64 
Packages
          500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 
Packages
          100 /var/lib/dpkg/status
       3.28.2-1 500
          500 http://de.archive.ubuntu.com/ubuntu bionic/main amd64 Packages

  $ evince --version
  GNOME Document Viewer 3.28.4

  $ cat /etc/lsb-release 
  DISTRIB_ID=Ubuntu
  DISTRIB_RELEASE=18.04
  DISTRIB_CODENAME=bionic
  DISTRIB_DESCRIPTION="Ubuntu 18.04.3 LTS"

  This is a fresh install of Ubuntu 18.04 LTS on x86-64 (the upgrade
  from 16.04 resulted in a non-booting system).

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