Poppler before 0.70.0 has a NULL pointer dereference in _poppler_attachment_new when called from poppler_annot_file_attachment_get_attachment.
https://usn.ubuntu.com/3837-2/
https://usn.ubuntu.com/3837-1/
https://security.gentoo.org/glsa/201904-04
https://gitlab.freedesktop.org/poppler/poppler/issues/664