Microsoft Internet Explorer fails to interpret NUL characters. Due to this, a slightly tweaked exploit for IE may pass through an IPS/IDS or anti-virus system without being caught but can still be executed in a malicious context in IE>
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/40049/IEnull.txt
Source: https://packetstormsecurity.com/files/40049/IEnull.txt.html