Working with attachments **to** a PDF file in Preview

I've got a PDF that has something else (actually, another PDF) as an attachment. Like most Mac users I use Preview by default to view PDFs, and Preview gives no indication that I can find that there is an attachment, nor can I figure out how to access the attachment now that I know it's there. I was pretty confused until I tried Adobe Reader which immediately makes it clear that there is an attachment. Am I missing something here or is Preview essentially ignoring attachments?