The remote host is running an Avira AntiVir product. The scan engine of the installed product is earlier than 188.8.131.52 / 184.108.40.206. Such versions reportedly fail to properly inspect specially crafted RAR/CAB/ZIP/LH files. An attacker could embed code in such files in order to circumvent detection by anti-virus software.
Use the Avira update feature to upgrade the scan engine to 220.127.116.11
/ 18.104.22.168 or later.