  Intermediate Mass Black Holes (IMBHs) are candidates to seed the Supermassive
Black Holes (SMBHs), and some could still wander in the Galaxy. In the context
of annihilating dark matter (DM), they are expected to drive huge annihilation
rates, and could therefore significantly enhance the primary cosmic rays (CRs)
expected from annihilation of the DM of the Galactic halo. In this proceeding
(the original paper is Brun et al. 2007), we briefly explain the method to
derive estimates of such exotic contributions to the anti-proton and positron
CR spectra, and the associated statistical uncertainties connected to the
properties of IMBHs. We find boost factors of order $10^4$ to the exotic
fluxes, but associated with very large statistical uncertainties.
