Unspecified vulnerability possibly a buffer overflow in Justsystem Ichitaro 2007 and earlier allows remote attackers to execute arbitrary code via a modified document as actively exploited in August 2007 by malware such as Tarodrop.D (Tarodrop.Q) a different vulnerability than CVE-2006-4326 CVE-2006-5424 CVE-2006-6400 and CVE-2007-1938.