Why was this allowed through? invoke.js threat level: high but allowed?

[The Law]

Event: Download allowed
User: DESKTOP-3TOKG9M\xxxxxxxxxxx
User type: Active user
Application name: chrome.exe
Application path: C:\Program Files (x86)\Google\Chrome\Application
Component: Web Anti-Virus
Result description: Allowed
Type: Probability of unauthorized software download
Name: http://courierregistered.com/e1710ec63e5c050390acceae0d455bdb/invoke.js
Threat level: Medium
Object type: Web page
Object name: invoke.js
Object path: http://courierregistered.com/e1710ec63e5c050390acceae0d455bdb
Reason: Cloud Protection