Prime Minister Tun Dr Mahathir Mohamad shakes hands with China's Premier Li Keqiang at the end of a news conference at the Great Hall of the People in Beijing August 20, 2018.
The documents reportedly show that "Chinese officials told visiting Malaysians that China would use its influence to try to get the US and other countries to drop their probes of allegations that allies of then-Prime Minister Najib Razak and others plundered the fund known as 1MDB".
In a statement in response to the Journal report, the Chinese embassy in Kuala Lumpur said China never attached political conditions to its cooperation with other countries.
"We do not accept any groundless accusations made against China", the embassy said.
This included surveilling WSJ reporters in Hong Kong who had been investigating 1MDB, the Journal reports, including by "full scale residence/office/device tapping, computer/phone/web data retrieval, and full operational surveillance." .
In return for China's bailout, Malaysia offered stakes in railway and pipeline projects for China's One Belt, One Road program of building infrastructure overseas.
1MDB acquired global attention as it involved claims of misappropriation and money laundering, with the US, Malaysia and Singapore probing on the case.
"With the likelihood that the respondent will abscond, I am of the considered view that the respondent's presence (in court) can not be secured by the setting of bail or the setting of any condition to the granting of bail", he said.
The Malaysian government will scrutinise bilateral deals made with China under the previous government, finance minister Lim Guan Eng said on Tuesday (Jan 8).
"We know that the price (of projects with China) is inflated, but whether there was such a deal, I have to check", the Malay Mail cited Lim as saying during a press conference at the finance ministry in Putrajaya.
Low, who is reported to be living in China, has consistently denied any wrongdoing.
Malaysian prosecutors say there is no conflict between the American attempt to extradite Ng and the charges he faces in Malaysia, and suggest the U.S. will wait for proceedings in Malaysia to wrap up before moving forward with their case.
Malaysia's current government, which toppled Najib from power in a shock election victory last May, has halted billion-dollar projects backed by China.
The US State Department alleges that US$4.5 billion was looted from the fund by Najib and his cronies, and spent on everything from artwork to high-end real estate.