Win or bust. A draw (even though it would mathematically still keep us in contention to qualify in second place) will not be good enough in my opinion.
Atleti and Oly are on 6, while we are at 3. Atletico will most probably beat Malmo. If we draw with Oly, then it's Atleti 9, Oly 7, Juve 4, with Oly having an additional 0.5 pts on us due to the h2h. Then even if we beat Malmo in Sweden and Atletico beat Oly in Madrid, the situation will be: Atletico 12, Oly 7, Juve 7. Then in the last round we'll have to beat Atletico and hope that Olympiacos fails to beat Malmo in Greece. Imo, with a draw we're as good as eliminated.
Only a win counts.
