The post is well-regarded in the security community for its detailed breakdown of exploiting a vulnerability in how antivirus engines handle (often seen as .rar files). Key technical highlights from that "solid" post include:
: Using specific techniques to manipulate the memory layout. Black _Hat.rar
If you were referring to a different "Black Hat" themed post or a specific file you found, The post is well-regarded in the security community
: Successfully writing a Return-Oriented Programming (ROP) chain and shellcode into the window buffer to achieve remote code execution. Black _Hat.rar
: Implementing basic Rar1 and Rar3 encoders to gain control over read-write primitives.