Off the top of my head, it could be that XeTeX truncates its output to
79 bytes (not characters), and that some of the UTF-8 byte sequences are
(incorrectly) split in half. The two codes you see on either side of
the line (DB and B1), when interpreted as hexadecimal digits, are the
UTF-8 form of U+06F1 EXTENDED ARABIC-INDIC DIGIT ONE. But it's hard to
tell without seeing the actual log file and the original source; clearly
the file you attached isn't the whole story, because it does have any
\message, and does not use an appropriate font.
Arthur
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