Is there any solution for unreadable Arabic characters in PDF - pdf

please I need help with PDF file that have Arabic characters ,it is old document exported from old version from oracle , when i open the document all characters are unreadable , I tried to add many Arabic fonts in windows fonts and also in adobe fonts, the same result still view unreadable,
can anyone help please.
Document properties:
Application:Oracle 9 i a s Report services
PDF producer: Oracle PDF Driver
PDF Version:1.4(Acrobat 5.x)
Thank you

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