These were the funds mistakenly sent to the dao 7 days ago, right after the hardfork. 1 hour earlier before going back to the dao, 38K of ETH had been received by the contract during the normal refund operation.
This contract has also participated in draining and, as seen in the history, has been sending and receiving neat chunks of dao to and from multiple dao contracts until they were cleared of dao tokens.
https://np.reddit.com/r/ethereum/comments/4v0v9k/someone_just_split_from_the_dao_and_drained_it/
Any guesses if they'll fork again to rescue these funds? Why not? The precedent is there.