Cracking pdf file with arabic password using hashcat

[elias]

I have been doing some test on password strength using arabic passwords and try to crack it using hashcat and when i used a non salted hash like a custom generated md5 hash and tried using --hex-charset parameter and it works like a charm but when i try it on pdf files it is not working i even decreased the password to 1 character
in case you are wondering:

• i followed this blog http://blog.bitcrack.net/2013/09/cracking-hashes-with-other-language.html but works only for non salted hashes.
  
  
• i used pdf2jhon.py to extract the hashes. yes using the above steps it can also work for english.
  
  
• --hex-salt is not supported on 10500(pdf format)
  

My assumptions are:

1.maybe the pseudo random salt generator takes chars from the password itself
2.the password hashing algorithm stores the password in unknown charset format when the password is from non-English chars

So my question is:

1.is there another workaround on this(is it possible)?
2.if my 2nd guess is correct please tell me what charset?