I think if you searched more you will find something, i was have a excl file with a pasword and i searched for 2 hours but i found something at the end. I'm sure there is something for PDF too.
some people in my country use tools name 'type hip', it will sending mass 4-6 different character randomly until the password resolved, it spend 4-6 hours to complete 4 character password, maybe you can find it on the goolgle
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