The software giant said the attacker accessed Adobe customer IDs and passwords. Through that, the hackers were able to remove customer names, encrypted credit and debit card numbers, expiration dates and other information related to orders from customers worldwide.
Much of the stolen data was encrypted, but Adobe said it is notifying customers and resetting passwords as a precaution. The company has also alerted banks processing Adobe payments to help protect customer accounts. It is also working with federal law enforcement on its investigation.
In another attack, the company said hackers also got copies of the source code of some Adobe products. The company believes the two attacks are related.
Adobe shares fell 64 cents to close at $50.88 Thursday and were unchanged in after-hours trading.
The Associated Press contributed to this report.