Questions like this is, what ICMizer is for, and they actually give everyone a free daily hand just for signing up. Anyway I plugged it in for you based on the information given: 13 players left, Hero 10BB stack, CO 25BB stack, BB 5BB stack, Hero 8. place overall. I had to estimate the other stack sizes of course, so its not 100% correct. I also did not know the exact payout, so I just picked a random MTT (27 paid on 888 Poker). None of this should matter much though, since there was low ICM-pressure. This is ICMizers range for Hero jamming:
A9o+, A3s+, KQo, KTs+, QTs+, JTs, T9s, 33+
Some of these hands are so marginal, you can take them off, if you want to. "Look for a better spot", as the saying goes. If you require to have an EV of at least 0,1% of the price pool, then the range become:
ATo+, A9s+, KJs+, 44+
However if CO was "opening loose", there is probably little need to narrow our range, and regardless A9s is still a jam. In general running into AK does not mean, a jam was bad. It just mean, the opponent was near the top of his range. Sometimes we will also run into AA, and then every single hand is in bad shape except the other AA.