Properties of $P_c(4312)$ pentaquark and its bottom partner.

We present an analysis of the newly observed pentaquark $P_c(4312)^+$ to enlighten its quantum numbers. To do that, the QCD sum rule approach is used. The measured mass of this particle is close to $\Sigma_c^{++}\bar{D}^-$ threshold and has a small width, and this supports its possibility of being a molecular state. We consider an interpolating current in a molecular form and analyze both the positive and negative parity states with spin-$\frac{1}{2}$. We also consider the bottom counterpart of the state with similar molecular form. Our mass result for the charm pentaquark state supports that, the quantum numbers of the observed state is consistent with $J^P=\frac{1}{2}^{-}$.