This is not a book, but a software component (specifically, this particular one contains the stuff that allows to "share" that you finished reading a book). It should normally reside in the system/acw folder, not in the documents one - and in any case, it shouldn't show up as a book.
So: try deleting it. If you can't on the Kindle, try from the PC (but only if you find it inside the documents/ folder or a subfolder thereof).
Code:
ixtab@pc:~$ find /media/Kindle/ |grep acw
/media/Kindle/system/acw
/media/Kindle/system/acw/stock-corrections-20130611222429.acx
/media/Kindle/system/acw/stock-xray-20130611222429.acx
/media/Kindle/system/acw/stock-authorpages-20130611222429.acx
/media/Kindle/system/acw/stock-endactions-20130611222429.acx
/media/Kindle/system/acw/stock-wikipedia-20130611222429.acx
/media/Kindle/system/acw/stock-translator-20130611222429.acx
/media/Kindle/system/acw/stock-gotoui-20130611222429.acx