如何在Java上下文中检测MS Office文件中的附件。

I am having a web application and we are implementing an upload document feature. We have implemented some content filtering logic based on the File Magic Number and AntiVirus checks are implemented based on ClamAV/libclamav.jar API. We are thinking of having a check for MS Office files having attachments. How can we do list/detect the attachments in an MS Office files MSWord/Excel/Ppt using JAVA. ?I am having a web application and we are implem