Issues in DOMPDF Generation

I am trying to render a page in malayalam and need to generate the PDF in malayalam. But the generated pdf contains only '?' characters...

Added below code in the HTML template file.

and the function to generate pdf contains below section.

$data = array( 'total_disbursed_amount' => $sanctioned_amount, 'beneficiary_count' => $total_recs, 'disbursed_by' => Auth::user()->name, );

    view()->share('data', $data);
    $action =  PDF::loadView('htmltopdfview')->save(public_path(). "/uploads/disbursements/".$filename);

Request to provide a solution that will fix the issue.

Thanks, Sreejith