  We report the synthesis, crystal structure, and physical properties of a
novel ternary compound, Th$_2$Cu$_4$As$_5$. The material crystallizes in a
tetragonal structure with lattice parameters $a=4.0716(1)$ {\AA} and
$c=24.8131(4)$ {\AA}. Its structure can be described as an alternating stacking
of fluorite-type Th$_2$As$_2$ layers with antifluorite-type double-layered
Cu$_4$As$_3$ slabs. The measurement of electrical resistivity, magnetic
susceptibility and specific heat reveals that Th$_2$Cu$_4$As$_5$ undergoes bulk
superconducting transition at 4.2 K. Moreover, all these physical quantities
exhibit anomalies at 48 K, where the Hall coefficient change the sign. These
findings suggest a charge-density-wave-like (CDW) transition, making
Th$_2$Cu$_4$As$_5$ a rare example for studying the interplay between CDW and
superconductivity.
