It could be bait—the school is more secure than ever, and he may be keeping track of who knows that the books are being read. The wisdom of this is still questionable, but given how flashy Hermione’s murder was, Malfoy is probably assuming that the killer can’t just walk up to him and Avada Kedavra him when no one is looking.
I question the wisdom of reading books that someone was potentially killed for reading without better opsec than Malfoy was demonstrating.
Malfoy did hand the books for someone else to read.
It could be bait—the school is more secure than ever, and he may be keeping track of who knows that the books are being read. The wisdom of this is still questionable, but given how flashy Hermione’s murder was, Malfoy is probably assuming that the killer can’t just walk up to him and Avada Kedavra him when no one is looking.