Tension over undemarcated points on the two nations' 817km land border erupted into a deadly five-day conflict in July, killing at least 48 people and temporarily displacing hundreds of thousands in their worst fighting in more than a decade.
"During the summit, we hope to see the signing of a declaration, known as the Kuala Lumpur Accord, between these two neighbours to ensure peace and a lasting ceasefire," Malaysian Foreign Minister Mohamad Hasan told the media on Tuesday.
He was referring to a leaders meeting of the Association of Southeast Asian Nations (ASEAN) set to run October 26-28 in the Malaysian capital of Kuala Lumpur.
Malaysian Prime Minister Anwar Ibrahim, the current chair of ASEAN, has said Trump will attend the meetings but there has been no official confirmation yet from Washington.
The White House did not immediately respond to a request for comment, but a person familiar with the matter said the trip is being planned.
Malaysia brokered an initial ceasefire on July 28 that ended the clashes after a sustained peace push by Anwar and phone calls by Trump to leaders of both nations.
Malaysia and the US will facilitate a broader ceasefire between Thailand and Cambodia, which will require both sides to remove all mines and heavy artillery from their borders, Mohamad said.
On Sunday, the Thai foreign ministry said the foreign ministers of both countries met in Kuala Lumpur over the weekend to discuss the ceasefire, with US and Malaysian officials present.
The East Asia Summit, to be held during this month's ASEAN meeting, will issue a chairman's statement, rather than a joint statement, as the United States had objected to use of the word "inclusivity", Mohamad added, without elaborating.
Leaders of all 10 members of the grouping and trading partners, such as China, Japan, Russia and the US, will attend the summit.
