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Hacking techniques include penetration testing, network security, reverse cracking, malware analysis, vulnerability exploitation, encryption cracking, social engineering, etc., used to identify and fix security flaws in systems.

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Source: https://code.google.com/p/google-security-research/issues/detail?id=549

If the numFonts field in the TTC header is greater than (SIZE_MAX+1) / 4, an integer overflow occurs in filevirus_ttf() when calling CSafeGenFile::SafeLockBuffer.

The TTC file format is described here https://www.microsoft.com/typography/otspec/otff.htm

Proof of Concept:
https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/38934.zip