Medical device maker Boston Scientific is being hit by a cyber attack. The shares are falling

The company flag flies in front of Boston Scientific Headquarters in Natick, Massachusetts. JB Reed | Bloomberg | Getty Images Boston Scientific said Wednesday it was hit with a cyberattack this week that is affecting its operations. The disclosure sent shares of the $72 billion medical device maker lower. The attack is disrputing Boston Scientific's access to company information systems and applications, including shipments services, the company said in a SEC filing. "While the company is working diligently to restore affected functions and systems access, the timeline for a full restoration is not yet known," the filing said. Shares were down 3.5% in premarket trading on Wednesday. Shares of the maker of devices such as pacemakers and stents have been nearly cut in half already this year, under pressure after issuing a weak profit forecast in the first quarter.