The /proc/PID/exe file on procfs-enabled systems is a symbolic link to the actual binary of the specified process (PID) on disk.
% ls -l /proc/self/exe lrwxrwxrwx 1 daniel daniel 0 Apr 2 10:17 /proc/self/exe -> /usr/bin/ls*
/proc/PID/exe
0001-01-01
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