How did Hank Pym know what the Tesseract is?

So in Endgame, Silly Steve prank-calls Hank Pym, tellink him about how the cube is waiting for him down there, few men got sick, etc... My question is: How did he know what was it? I know HS studied it, but did he published like an essay about it to S.H.I.E.L.D, or what happened?

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