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Ahhh sorry to drop in on this conversation so late, but I really love HP too.
First things first, I’m a Slytherin. My patronus is a snowy owl, and my wand is 12.5” ash wood with a dragon heartstring core and hard flexibility (yes, I’m every bit as stubborn as I sound).
To answer your question, Malfoy’s wife was Astoria Greengrass. She was also (maybe?) a Slytherin. Her older sister, Daphne Greengrass, was in the same year as Draco and the golden trio.wHERE DID YOU FIND THAT WHEN
Which part? About Astoria? Go digging through Pottermore. There's a lot of stuff that isn't explicitly mentioned in the books.