A Musical Mix-up

Steganography [200pts]

Description: One of our guys found a strange midi file lying around on our servers. We think there might be some hidden data in it. See if you can help us out!

We are given a midi file (challenge.mid) that plays a sequential tune. When we analyze this midi file using a MIDI file to text online tool, we see interesting values:


The numbers on the right look especially interesting, I thought of ASCII decimal values and it turns out that this does spell out the flag:

114 97 99 116 102 123 102 53 48 99 49 51 116 121 95 108 51 118 101 108 95 53 116 51 103 33 125

Flag: ractf{f50c13ty_l3vel_5t3g!}

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