Malaysia will file a legal challenge to a settlement agreement between scandal-plagued state fund 1MDB and Abu Dhabi sovereign fund IPIC negotiated during the premiership of former prime minister Najib Razak, its attorney general said on Tuesday, New Straits Times reports. A US$50.3 million interest payment guaranteed by IPIC is due on Oct 18, while another US$52 million payment is due next month.  Malaysia’s Anti-Corruption Commission deputy chief Azam Baki confirmed that anti-graft officers have begun a fresh investigation into Najib’s role in the debt settlement.