Exploit-TaroDrop.g is a Trojan that is delivered via a specially crafted Ichitaro document. Ichitaro is a Japanese word processing application provided by JustSystem. When successful, it will drop and execute a malicious Win32 executable embedded inside the document.

A patch for this vulnerability has been published by vendor. Japanese users of this application may find more information on the vulnerability and its patch at: http://www.justsystems.com/jp/info/js09001.html (in Japanese)

Upon launching the document, it exploits a vulnerability in Ichitaro and executes an embedded executable.

More information can be found at this McAfee page.