This indicates an attack attempt to exploit a Buffer Overflow vulnerability in PTC Arbortext.
The vulnerability, which is located in the "IsoView" ActiveX control, can be exploited through misuse of a vulnerable method. An attacker can exploit this by tricking an unsuspecting user into visiting a malicious webpage and execute arbitrary code within the context of the targeted users' browser.
PTC Arbortext IsoView 7.3 and prior
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor