I'm guessing they're octal by some weird default. I was able to make similar output making up a dummy file using that presumption (entering his numbers using hexl-mode in emacs) that produced similar output on OS X with the default /usr/bin/hexdump. I'm partial to od -xa myself.
$ hexdump -c foo
0000000 \0 \0 001 257 \n 344 \0 003 \0 \0 \0 s \0 006 002 26
+7
0000010
$ od -xa foo
0000000 0000 af01 e40a 0300 0000 7300 0600 b
+702
nul nul soh af nl e4 nul etx nul nul nul s nul ack stx
+b7
0000020
Edit: Derp, his \a should of course be 0x07 not \n / 0x0a. I need moar caffeine . . .
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