This indicates an attack attempt to exploit a Denial of Service vulnerability in ISC BIND.
The vulnerability is due to an error in the application when handling unknown data types. A remote attack may be able to exploit this to cause a denial of service condition on the affected system.
ISC BIND 9.0.x-9.6.x
ISC BIND 9.6-ESV-R7
ISC BIND 9.7.6
ISC BIND 9.8.3
ISC BIND 9.9.1
Denial of Service: Remote attackers can crash vulnerable systems.
Apply the most recent upgrade or patch from the vendor.