Answer:
Yes, something is an indefinite pronoun
Step-by-step explanation:
Indefinite Pronoun - refers to an unspecified noun, or sometimes just to things in general
all, another, any, anybody, anyone, anything, both, each
each one, each other, either, everybody, everyone
everything, few, many, neither, nobody, none, no one, nothing
one, one another, other, others, several, some, somebody
someone, something