This indicates an attack attempt against a Code Execution vulnerability in Microsoft SQL Server.
The vulnerability is caused by an error when the vulnerable software handles a specially crafted user-supplied script. A remote attacker may be able to exploit this to execute arbitrary code within the context of the application.
Microsoft SQL Server 2008
Microsoft SQL Server 2012
Microsoft SQL Server 2014
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.