/usr/share/pam/common-session.md5sums is in libpam-runtime 1.1.8-3.1+deb8u2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | 4845c1632b3561a9debe8d59be1b238e /etc/pam.d/common-session
4a25673e8b36f1805219027d3be02cd2 # 1.0.1-4ubuntu5 - 1.0.1-4ubuntu5.5
240fb92986c885b327cdb21dd641da8c # 1.0.1-6 -
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