An attachment named doattachfile.action.html is treated by the PermissionCheckDispatcher as an action; which it attempts to verify permissions for.

005-02-11 16:01:02,851 ERROR [atlassian.confluence.security.PermissionCheckDispatcher] Error determining permissions for url /pages/moveattachment.action?pageId=472&fileName=doattachfile.action.html&newPageName=Home (Action : moveattachment.action?pageId=472&fileName=doattachfile)
com.opensymphony.xwork.config.ConfigurationException: There is no Action mapped for namespace /pages and action name moveattachment.action?pageId=472&fileName=doattachfile
at com.opensymphony.xwork.DefaultActionProxy.<init>(DefaultActionProxy.java:72)
at com.opensymphony.xwork.DefaultActionProxyFactory.createActionProxy(DefaultActionProxyFactory.java:54)
at com.atlassian.confluence.security.PermissionCheckDispatcher.isPermittedForUrl(PermissionCheckDispatcher.java:104)