There are lots of Shepherds and Malinois that have ears that DON"T go up either because of genetics or poor health. I would not rule Malinois out just because of the ears being droopy. I have seen (and bred) some Shepherds whose ears, for whatever reason, just did not stand. Sometimes they fall during teething and just never go back up.
Same is true of any breed with prick ears. Malamutes, Sibes, Pems, Cardis, Shepherds, Geez, the list could go on all day. Drop ears do not mean another breed is in there. Just could mean his ears did not go up. Lots of people who show the above breeds end up taping ears because they are not standing. If the ears never get taped, they just will never stand back up.
Mom to two beautiful boys, now in school to be a therapist and help other women with PPD.