/usr/share/apt-cacher/default/apt-cacher.md5sum is in apt-cacher 1.7.13+deb9u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | afc7a4b065275465c1eeb5a09c985bde AUTOSTART=0
f269a1c735ae47d7068db3ba5641a08b AUTOSTART=1
1207bbf54d26ab191dbac80fe336dc48 pre 1.7: AUTOSTART=0
046661f9e728b783ea90738769219d71 pre 1.7: AUTOSTART=1
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