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/usr/share/xscreensaver/config/xmatrix.xml is in xscreensaver-data-extra 5.15-3ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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<?xml version="1.0" encoding="ISO-8859-1"?>

<screensaver name="xmatrix" _label="XMatrix">

  <command arg="-root"/>

  <hgroup>
   <select id="size">
     <option id="font1" _label="Small font"  arg-set="-small"/>
     <option id="font2" _label="Large font"/>
   </select>

   <select id="mode">
     <option id="matrix" _label="Matrix encoding"/>
     <option id="binary" _label="Binary encoding"      arg-set="-mode binary"/>
     <option id="hex"    _label="Hexadecimal encoding" arg-set="-mode hex"/>
     <option id="dna"    _label="Genetic encoding"     arg-set="-mode dna"/>
     <option id="pipe"   _label="Piped ASCII text"     arg-set="-mode pipe"/>
   </select>

   <select id="fill">
     <option id="both"   _label="Synergistic algorithm"/>
     <option id="top"    _label="Slider algorithm"    arg-set="-insert top"/>
     <option id="bottom" _label="Expansion algorithm" arg-set="-insert bottom"/>
   </select>
  </hgroup>

  <hgroup>
   <boolean id="trace" _label="Run trace program" arg-unset="-no-trace"/>
   <boolean id="knock" _label="Knock knock"       arg-unset="-no-knock-knock"/>
   <string id="phone" _label="Phone number" arg="-phone %"/>
  </hgroup>

  <hgroup>
   <vgroup>
    <number id="delay" type="slider" arg="-delay %"
            _label="Frame rate" _low-label="Low" _high-label="High"
            low="0" high="100000" default="10000"
            convert="invert"/>

    <number id="density" type="slider" arg="-density %"
            _label="Density" _low-label="Sparse" _high-label="Full"
            low="1" high="100" default="75"/>

    <boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
   </vgroup>
   <vgroup>
    <xscreensaver-text />
   </vgroup>
  </hgroup>

  <_description>
Draws the "digital rain" effect, as seen on the computer monitors in
"The Matrix".

See also "GLMatrix" for a 3D rendering of the similar effect that
appeared in the movie's title sequence.

http://en.wikipedia.org/wiki/Matrix_digital_rain

Written by Jamie Zawinski; 1999.
  </_description>
</screensaver>