ClamWin: False alarm or actual worm in PortableChrome?

Hi

I recently ran ClamWin on a friend's win7 computer and it found a Worn in Chrome Portable. This application was never used, so I assume there is either a bug in the detection of ClamWin or the application came with the worm out-of-the-box :{

C:\PortableApps\PortableApps\GoogleChromePortable\App\Chrome-bin\47.0.2526.106\nacl64.exe: Win.Worm.Nimda-59 FOUND