M1Y001 is a "container" hot fix that contains "member" hot fixes which will update your SAS software components.
See "What is a container hot fix?" in the SAS Hot Fix FAQ for more information on container and member hot fixes.
A manifest listing the contents of each of the following "member" hot fixes is available:
M1W001 manifest for SAS Web Infrastructure Platform Data Server 9.4_M8
M1X001 manifest for SAS Web Infrastructure Platform Data Server Configuration 9.4_M8