WebKit on Apple Mac OS X 10.4 through 10.4.10 does not create temporary files securely when Safari is previewing a PDF file, which allows local users to read the contents of that file.
https://exchange.xforce.ibmcloud.com/vulnerabilities/38487
http://www.vupen.com/english/advisories/2007/3868
http://www.us-cert.gov/cas/techalerts/TA07-319A.html
http://www.securityfocus.com/bid/26444
http://securitytracker.com/id?1018948
http://secunia.com/advisories/27643
http://lists.apple.com/archives/security-announce/2007/Nov/msg00002.html