I upgraded to Yosemite when it first came out and had no issues. Today while I was creating a new Admin username on my Mac, the dock on the new username had iPhoto, Keynote, Pages, and Numbers with question mark icons. I know what the question mark icons mean but I have never had those apps installed ever on my Mac before. I tried creating another username and the dock looked fine without these apps but I created a third username to see if it would happen again and it did. I tried deleting the dock.plist and force quit the dock, but still the apps were in the dock. Clicking on them does nothing. Right clicking has a show recent option which just shows a blank Launchpad. I could get rid of them though by right click > options > and remove from dock. But my concern is how these apps showed up, could this be a malware of some sort?