If you have the Mavericks installer (a .dmg file), you can create a bootable USB drive:
Disconnect from the internet, open Terminal during the installation process, and change the system date to a time closer to the OS release (e.g., date 110113002013 for Nov 1, 2013). Fixing Attributes:
The "x" represents sub-versions. The final and most stable version is (Build 13F1911). If you find a DMG labeled 10.9.0, you will need to manually download the 10.9.5 combo update later.
For OS X Mavericks, the is a bootable disk image containing the full installer for versions 10.9 through 10.9.5 (the final, most stable update).
: macOS Mavericks was released in 2013 and received several updates. However, as with all software, support for it has ended. Apple's support pages and community forums are great resources for troubleshooting.