The Ghana international came on in the 74th minute to replace two goal hero Marides.
The pacy winger's introduction was immediately felt when he played a part in his sides third goal, five minutes after coming on.
CSKA Sofia, who had secured a 3-0 first leg win, started in the same manner they did in Bulgaria a week ago after forward Maurides opened the scoring on 14 minutes.
He doubled the lead in the 53rd minute with a fine finish before Admira pulled one back through Cinan Barkis.
Sofia made it 3-1 after Jorginho scored with ten minutes to finish the game.
Gyasi scored in last week's 3-0 win aand now they progress 6-1 on aggregate.
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