The IRNA report late yesterday did not specify what Mohammad Reza Rahimi, a top aide to ex-President Mahmoud Ahmadinejad, was convicted of but said the verdict was binding.
It also said the court ordered Rahimi to pay compensation equivalent to some USD 800,000.
A local court had initially sentenced Rahimi to 15 years prison, but the supreme court reduced the term to five years and three months, IRNA said. Rahimi has long maintained his innocence
Ahmadinejad's successor, President Hassan Rouhani, in December criticised growing corruption in the country in unusually blunt terms, saying that bribes once paid secretly are now being disbursed in the open.
Ahmadinejad has repeatedly claimed that he led the "cleanest administration" in Iran's history.