When files are submitted to FireEye MAS 7.x through Data Enrichment these files will not create an analysis task.
Instead, the /var/log/messages log will show something like this:
Nov 6 06:09:55 hostname Data-Enrichment: error: ERR_CODE_RUNTIME_EXCEPTION : Failed to submit artifact: % File hostname_2014-11-06T08.45.00-0500_10.0.0.1-51098_192.168.2.122-80_172e6256e2f6ca8f587b322dcab6c94f1_22.exe does not exist