/usr/share/doc/libpst-0.6.54/devel/structpst__item__attach__coll__graph.md5 is in libpst-doc 0.6.54-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1
d4011a7a156856501e544b67849ad054