How secure is an encrypted .doc file from hacking?

Question

Malware

How secure is an encrypted .doc file from hacking?
If you follow all the recommendations for compiling passwords (upper and lower case, numbers, symbols, etc.)

Answer 1

Related article - www.osp.ru/winitpro/2011/03/13009258
Describes encryption methods in different versions of Office.

Answer 2

If the algorithm of the developer of the .doc format is, then, you understand.
Encrypt with the strongest encryption.

openssl aes-256-ctr -pass file:./passwordfile < file.plain > file.enc
openssl aes-256-ctr -d -pass file:./passwordfile < file.enc > file.plain

www.shellhacks.com/en/Encrypt-And-Decrypt-Files-Wi...

Answer 3

If the encryption algorithm is RC4 there, then it is very poorly protected