Malaysian Prime Minister Najib Razak on April 3, 2014 in Perth, Australia

At least half a dozen suitors have bid for energy assets of Malaysia's debt-laden state fund 1Malaysia Development Bhd (1MDB), despite it being at the center of the country's ongoing political crisis, according to four people familiar with the matter.

Infrastructure companies in Malaysia and the Middle East are among those interested in assets in 1MDB's unit Edra Global Energy, as the fund tries to raise funds to pay down some of the $11 billion debt it has accumulated since its formation in 2009.