Symptoms
Assume that you upload a corrupted .xlsx, .pptx, or .docx file to a Microsoft SharePoint Server 2010 server. However, when you try to view the file in a web browser by using certain shared services, SharePoint consumes a large amount of memory. Additionally, the server freezes. For example, you upload an .xlsx file that contains unreadable content to a SharePoint server. However, when you try to view the file by using Excel Services, all memory on the server is consumed and the server freezes.
Resolution
To resolve this issue, apply the following hotfix packages:
2687617 Description of the SharePoint Server 2010 hotfix package (wdsrv-x-none.msp, xlsrvwfe-x-none.msp): October 30, 2012
2687562 Description of the Office Web Apps hotfix package (Wacwfe-x-none.msp, Xlwacwfe-x-none.msp): October 30, 2012
2687557 Description of the SharePoint Foundation 2010 hotfix package (Wss-x-none.msp): October 30, 2012
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
