The elderly man, who goes by the name Pa Ya, was arrested in Kampung Tunku, Petaling Jaya yesterday, Johor police chief Comm Datuk Wan Ahmad Najmuddin Mohd said.
The suspect, who can be fined over USD 12,000 or jailed for a year or both, had uploaded the photo into a WhatsApp group called "Bicara Politik Melayu", The Star reported.
Police arrested him for sharing a crude photo insulting the Prime Minister in a WhatsApp group, the report said.
A police report in this regard was lodged on Friday following the posting of the photo.
Also Read
Ahmad said that the suspect would be remanded at the Johor Baru court for investigations under relevant provisions of the law which carries a maximum fine of 50,000 Malaysian Ringgit (USD 12,526) or up to a year's jail, or both upon conviction.
A task force had been formed within the police force to monitor, identify and take action against those who misuse social media, Ahmad said.