Is it possible to attack a Word 2003 doc with a 128 bits RC4 key ? ($oldoffice $4)

[marc1n]

You can't break a hash with a vulnerability, try using john the ripper maybe it will help https://www.openwall.com/john/

Thanks, I installed john the ripper and looked at the documentation, but it looks like an inferior version of hashcat, and doesn't seem capable of exploiting any vulnerabilities.

Am I missing something ?

Programmes such as hashcat or john do not exploit the vulnerabilities or gaps found. They only break hashes.