That will find all the names that are the same binary that is used as "mdb". I've seen way too many things like "hardening guidelines" for Solaris that miss this. They tell you to chmod mdb to something like 600 and wind up breaking everything that runs ksh.
And if you know what you're doing it doesn't even remove access to "mdb"...
That is correct and indeed a good advice. Note however that this issue doesn't affect ftp which is a standalone binary with Solaris, something unlikely to change.