$this->mpdf = new Mpdf();

    $this->mpdf->SetDisplayMode('fullpage');
    $this->mpdf->SetCompression(false);
    $this->mpdf->SetSourceFile(APP . 'Template' . DS . 'Pdf' . DS . 'sample.pdf');
    $tpl = $this->mpdf->ImportPage(1);
    $this->mpdf->AddPage();
    $this->mpdf->useTemplate($tpl);

    $this->mpdf->Output(TMP . 'test.pdf');