Are you playing a style where partner raises directly with a 1354 minimum? If so, partner's mostly likely shape is 2254 with stronger 1354 bidding 4♥ over 2♠. I can't really think of a hand that bids 4th suit and then jumps to 5D over 2♥ when partner might have a 2254 17/18 count, so it should probably be artificial but it is rather torturing partner unless you've explicitly agreed what it is.