pdfjam creates the (1) pdf90, (2) pdfjoin, and (3) pdfnup files with a predictable name, which allows local users to overwrite arbitrary files via a symlink attack.
https://www.redhat.com/archives/fedora-package-announce/2009-March/msg00488.html
https://www.redhat.com/archives/fedora-package-announce/2009-March/msg00484.html
https://exchange.xforce.ibmcloud.com/vulnerabilities/47519
https://euvd.enisa.europa.eu/vulnerability/EUVD-2008-5713
https://bugzilla.novell.com/show_bug.cgi?id=459031
http://www.securityfocus.com/bid/32931
http://www.openwall.com/lists/oss-security/2008/12/19/3