LRF files do not support right-to-left scripts.
PDF with an embedded font is your best bet.
Presumably there must be OCR apps which deal with non-Roman alphabets, but I'm afraid that I don't know what they are. I would imagine OCR of Arabic would be a real challenge, given the cursive nature of the script and the huge range of "styles" of writing! Rather like trying to OCR handwriting.
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