Just did that yesterday: called 100bb all in vs an aggro-donk with TT. He showed A2o.
(I could also say that the first card that popped on the flop was an A, but nobody would give a shit).
To estimate a rough range, you should look at what frequency they do that and note what they show up with. Some do it every hand, some every other hand, some with all their Ax, some only with AK and/or PP because they have no idea how to play them post flop, etc
If you have seen your villain play for a while but it is the first time he does that, I wouldn't call as it will often be AK or a PP, and you're a dog against that range. Besides even terrible villains are aware that if you raise UTG you have a hand you don't want to fold.
edit: OK you're really in the CO so ignore the UTG comment
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