Port Dickson MP Anwar Ibrahim said today that his office and social media accounts were hit by a cyber attack.
In a statement, Anwar urged all parties to be wary of information said to be in his name sent from his office and social media accounts.
"We are working with the relevant parties to settle this issue of cyber intrusion," he said.
An aide to Anwar told Malaysiakini that the attack started last Friday.
The PKR leader added that the rising number of cyber attacks is in line with the increasing amount of time people spend online.
"Clearly, it is a negative impact on our excitement for technology, and exposure to individuals using digital tools for personal profit or to create uncertainty and confusion.
"Big data and artificial intelligence will be driven well by the wide use of digital space, but it must be balanced by reasonable data protection and good approaches to how data is used," he said.