Transport Malware Agent question

I have installed Exchange 2013, and i am puzzled a bit. It's said anti-malware protection is enabled by default, and when i sent test e-mail with malware attachment it was blocked. Also I checked in EAC, that malware protection is running. But when I use Get-TransportAgent cmdlet, i getin results that malware agent is disabled. Why it is disabled, or what function it does?

RunspaceId            : 5505030d-dff7-47dd-9d25-64da1de5ce71
Enabled               : False
Priority              : 2
TransportAgentFactory : Microsoft.Exchange.Transport.Agent.Malware.MalwareAgentFactory
AssemblyPath          : C:\Program Files\Microsoft\ExchangeServer\V15\TransportRoles\agents\Antimalware\Microsoft.Exchange.Transport.Agent.Malware.dll
Identity              : Malware Agent
IsValid               : True
ObjectState           : New