The Kosmos 482 descent craft is the lander module from a 1972 failed Soviet Venera mission to Venus. The 500kg lander was designed to survive passage through the Venus atmosphere, it is possible that it could survive reentry through the Earth’s atmosphere intact.
Extract from the Wiki entry: “Its landing module, which weighs 495 kilograms (1,091 lb), is highly likely to reach the surface of Earth in one piece as it was designed to withstand 300 G’s of acceleration and 100 atmospheres of pressure…”
That thing will make a mighty splash if it hits the ocean, either that or generate a good sized crater