Pull every file embedded inside a PDF out as a ZIP
Run it through this tool - it will say. Attachments live in the reader attachments panel rather than on the page, so most people never notice them; e-invoices and technical reports carry them routinely.
Document-level attachments belong to the file as a whole. Others are pinned to a specific page as a file-attachment annotation, often shown as a small paperclip on the page. Both are extracted.
Yes. Names come out of the PDF and are untrusted, so they are sanitised to plain filenames before they reach the ZIP - a name containing a path could otherwise write outside the folder you extract into.
They are numbered so nothing is overwritten inside the ZIP.