This indicates an attempt to exploit a command execute vulnerability in the OS X Terminal of Mac OS X. A remote attacker could execute arbitrary commands with the privileges of the login user on the system via inserting commands in the x-man-path URI scheme.
Mac OS X version 10.3.9 and prior
Mac OS X Server version 10.3.9 and prior
Security Update 2005-005 (Client) :
Security Update 2005-005 (Server) :