* Consult your owner's manual: This is the most reliable source. The manual will have diagrams showing the location of the oil filter and other vital components.
* Look online for a specific diagram: Search for "2005 Chevy Malibu oil filter location diagram" on Google Images or YouTube. You'll find several pictures and videos showing exactly where it is.
Without knowing the specific engine in your Malibu (a 2.2L, 3.5L, or possibly another), a precise location is difficult to give. The general area described above is the most likely location, but visual confirmation is always recommended.