infected PC not get reported in console 4.5

Hi All,

In what circumstances would an infected PC not get reported in the console (normaly they do). I ask as we had a PC which caught Virus/spyware 'Mal/PDFJs-P' but it didn't appear on the console. I've checked the log on the PC and in console and the trojan was immediatey deleted.We're running 4.5 console and a mix of 7.6.20 (which this computer was) and 9.5.4's.

If this is the case would it not get reported?

Regards.