Specially crafted ZIP archives may be used to execute code on affected systems. Both RAR- and ZIP-archives can in addition be crafted to avoid successful scanning and obfuscate malicious code in the archive. It is possible to create specially crafted ZIP archives that cause a buffer overflow. This allows an attacker to execute code of his choice on affected systems. It is in addition possible to create malformed RAR- and ZIP-archives that cannot be scanned properly. This can lead to a false negative scan result.