Learn Hardcore Malay: Dia membaca laporan kejadian. - He/She reads the incident report.

Dia means he or she. Malay third-person singular pronouns do not usually show gender, so the sentence itself does not tell you whether the person is male or female.

A few useful points:

dia = he/she
It is commonly used for people.
It normally does not translate as it in standard learner contexts.

So Dia membaca laporan kejadian could mean either:

He is reading the incident report
She is reading the incident report

The exact choice depends on context.

Why is the verb membaca instead of just baca?

Membaca is the active verb form built from the root baca (read).

Root: baca = read
Active verb with prefix: membaca = to read / reads / is reading

The prefix here is meN-, which often marks an active verb in Malay. With baca, it becomes membaca.

Very roughly:

baca = the basic root
membaca = the normal finite verb form in a sentence like this

So in a complete sentence, membaca sounds more natural than just baca.