Catalyzes a reversible NAD-dependent dehydrogenase reaction involved in central metabolism and redox homeostasis between organelle compartments. (S)-malate + NAD(+) = H(+) + NADH + oxaloacetate Homodimer (By similarity). Interacts with 14-3-3-like proteins GRF1 GRF3 and GRF8 (PubMed:22104211). Expressed in rosette leaves at low levels. Belongs to the LDH/MDH superfamily. MDH type 2 family.