The filename string follows a specific naming convention used by Cisco for internal testing images that have "leaked" into the common network engineering community: Download i86bi-linux-l2-adventerprise-15.1b.bin (CISCO-GN)
The mention of free in the context of an "interesting" binary is a hallmark of vulnerabilities. x8664bilinuxadventerprisems1542sbin free
It may be a concatenation of:
ps aux --sort=-%mem | head -20