This indicates an attempt to exploit an arbitrary command execution vulnerability in Mac OS X.
The "Open 'safe' files after downloading" option in Safari on Apple Mac OS X allows remote attackers to execute arbitrary commands. This can be done by tricking a user into downloading a "__MACOSX" folder that contains metadata (a resource fork) that invokes the terminal. The terminal automatically interprets the associated script using the "bash" shell. For example, if a ZIP file that contains a script with a safe file extension is downloaded, the script will be executed. The script commands are executed in the context of the user opening the archive file.
Apple Mac OS X Server 10.4.5
Apple Mac OS X Server 10.3.9
Apple Mac OS X 10.4.5
Apple Mac OS X 10.3.9
System compromise: execution of arbitrary commands.
Apple has released security advisory APPLE-SA-2006-03-01 and APPLE-SA-2006-03-13 to address this issue.