Pyth, Maltysen, ≤4Pyth, Maltysen, ≤4
C.ZG
Brute force took so long that I did it faster manually.
Analysis
C (convert string to base 256 int) is the easiest way to generate a large number in Pyth, so it's probably the first character. If we convert from base 256, we get:
xÚKLJNIMKÏÈÌÊÎÉÍË/(,*.)-+¯¨¬
Hmm... not very illuminating.
Now G is the alphabet string "abc...z", which looks like it could be a source for a long string to feed into C. Looking through the docs I find:
.Z Compresses or decompresses a string.
If we're dealing with compression here, it wouldn't be surprising to get all sorts of extended ASCII characters. Trying C.ZG then gave the answer.