Was checking this simillar thread and it seems like SEP already has the definition for it
https://www-secure.symantec.com/connect/forums/some-virus-has-corrupted-many-our-microsoft-office-files-and-pdf-files
Good that you submitted the files to symantec...
whats the version of SEP you are using?
Ran a full scan in safe mode?
Have you tried malware bytes?