Malaysia’s former leader Najib Razak has sought to introduce fresh evidence in one of the criminal cases linking him to the 1MDB financial scandal, days before an appellate court was to rule on whether to uphold a guilty verdict that sentenced him to a 12-year jail term.The development ahead of the December 8 Court of Appeal ruling has raised questions among observers on whether Najib is seeking to delay the judgment amid a resurgence in his once-faded political clout.The former prime minister…