A search for the standard model Higgs boson is performed in 5.2 fb-1 of p$\bar{p}$ collisions at p √s = 1.96 TeV, collected with the DØ detector at the Fermilab Tevatron. The final state considered is a pair of b jets with large missing transverse energy, as expected from p$\bar{p}$→ ZH → v$\bar{v}$b$\bar{b}$ production. The search is also sensitive to the WH → ℓvb$\bar{b}$ channel, where the charged lepton is not identified. Boosted decision trees are used to discriminate signal from background. Good agreement is observed between data and expected backgrounds, and, for a Higgs-boson mass of 115 GeV, a limit is set at 95% C.L. on the cross section multiplied by branching fraction of (p$\bar{p}$ → (Z/W)H) × (H → b$\bar{b}$) that is a factor 4.57 expected and 3.73 observed larger than the value expected from the standard model.