  Compact Symmetric Objects (CSOs) have been observed with Chandra and
XMM-Newton to gain insights into the initial stages of a radio source evolution
and probe the black hole activity at the time of relativistic outflow
formation. However, there have been no CSO observations to date at the hard
X-ray energies (> 10 keV), impeding our ability to robustly constrain the
properties of the intrinsic X-ray emission and of the medium surrounding the
young expanding jets. We present the first hard X-ray observation of a CSO
performed with NuSTAR. Our target, OQ+208, is detected up to 30 keV, and thus
we establish CSOs as a new class of NuSTAR sources. We analyze the NuSTAR data
jointly with our new Chandra and archival XMM-Newton data and find that a
young, ~250 years old, radio jet spanning the length of ~10 pc coexists with
cold obscuring matter, consistent with a dusty torus, with an equivalent
hydrogen column density $N_H = 10^{23}$-$10^{24}$ cm$^{-2}$. The primary X-ray
emission is characterized by a photon index $\Gamma \sim 1.45$ and intrinsic
0.5-30 keV luminosity $L \sim 10^{43}$ erg s$^{-1}$. The results of our
spectral modeling and broad-line optical classification of the source suggest a
porous structure of the obscuring torus. Alternatively, the source may belong
to the class of optically un-obscured/X-ray obscured AGN. The observed X-ray
emission is too weak compared to that predicted by the expanding radio lobes
model, leaving an accretion disk corona or jets as the possible origins of the
X-ray emission from this young radio galaxy.
