  The recent results of IceCube Neutrino Observatory include an excess of PeV
neutrino events which appear to follow a broken power law different from the
other lower energy neutrinos detected by IceCube. The possible astrophysical
source of these neutrinos is still unknown. One possible source of such
neutrinos could be the decay of non-thermal, long-living heavy mass Dark
Matter, whose mass should be $> 10^{6} \rm {GeV}$ and could have produced at
the very early Universe. They can undergo cascading decay via both hadronic and
leptonic channels to finally produce such high energy neutrinos. This
possibility has been explored in this work by studying the decay flux of these
Dark Matter candidates. The mass and lifetime of such Dark Matter particles
have been obtained by performing a $\chi^2$ fit with the PeV neutrino data of
IceCube. We finally estimate the baryon asymmetry produced in the Universe due
to such Dark Matter decay.
