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?
Preview doesn't support this, but you can extract attachments on the command line using the popper tool
pdfdetach. To install poppler with Homebrew:
brew install poppler
To list attachments in a PDF file called
pdfdetach -list doc.pdf
To extract attachments from a PDF file called
pdfdetach -saveall doc.pdf