CVE 2007-6725
The CCITTFax decoding filter in Ghostscript 8.60, 8.61, and possibly other versions, allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a crafted PDF file that triggers a buffer underflow in the cf_decode_2d function.
See the 
CVE page on Mitre.org
for more details.
