  We report results of the first broadband observation of the transient X-ray
pulsar GRO J1008-57 performed in the quiescent state. Observations were
conducted quasi-simultaneously with the Mikhail Pavlinsky ART-XC telescope on
board SRG and NuSTAR right before the beginning of a Type I outburst. GRO
J1008-57 was detected in the state with the lowest observed luminosity around
several $\times 10^{34}$ erg s$^{-1}$ and consequently accreting from the cold
disk. Timing analysis allowed to significantly detect pulsations during this
state for the first time. The observed pulsed fraction of about 20\% is,
however, almost three times lower than in brighter states when the accretion
proceeds through the standard disk. We traced the evolution of the broadband
spectrum of the source on a scale of three orders of magnitude in luminosity
and found that at the lowest luminosities the spectrum transforms into the
double-hump structure similarly to other X-ray pulsars accreting at low
luminosities (X Persei, GX 304-1, A0535+262) reinforcing conclusion that this
spectral shape is typical for these objects.
