  We investigate the indirect signatures of the Higgs portal $U(1)_X$ vector
dark matter (VDM) $X_\mu$ from both its pair annihilation and decay. The VDM is
stable at renormalizable level by $Z_2$ symmetry, and thermalized by
Higgs-portal interactions. It can also decay by some nonrenormalizable
operators with very long lifetime at cosmological time scale. If dim-6
operators for VDM decays are suppressed by $10^{16}$ GeV scale, the lifetime of
VDM with mass $\sim$ 2 TeV is just right for explaining the positron excess in
cosmic ray recent observed by PAMELA and AMS02 Collaborations. The VDM decaying
into $\mu^+ \mu^-$ can fit the data, evading various constraints on cosmic
rays. We give one UV-complete model as an example. This scenario for Higgs
portal decaying VDM with mass around $\sim2$ TeV can be tested by DM direct
search at XENON1T and at the future colliders by measuring the Higgs
self-couplings.
