HONG KONG — Australia said on Wednesday that a foreign intelligence service had hacked into the country’s meteorology bureau last year, copying “an unknown quantity of documents” from its computer system.

A report, issued by the Australian Cyber Security Center, did not accuse any particular country of carrying out the intrusion. The hacking was reported last year by the Australian news media, which suggested that China was behind the breach, though its Foreign Ministry later denied that.

Australian investigators found evidence of malware popular with “state-sponsored cyber adversaries,” according to the report, which called the security controls at the Bureau of Meteorology “insufficient.”