OP's report comes from plot synopsis posted on /tv/, which is probably fake, considering the poster claimed he saw a fully-edited test-screening two days after the movie wrapped filming.
Here's the spoilers anyway.
In San Francisco, alcoholic journalist Eddie Brock (Tom Hardy) is released from prison and reaches out to his ex-wife, lawyer Ann Weying (Michelle Williams), and their young daughter, but is rejected. While sleeping in the woods, Brock witness a space probe crash nearby, and an extraterrestrial symbiote bonds to him. Brock flees as the government-sponsored Life Foundation arrives to collect their damaged probe. They find two other symbiotes, one that bonds with Dr. Emerson Collins (Reid Scott) and apparently kills him.
Brock is captured and experimented on by Dr. Dora Skirth (Jenny Slate) at the behest of Dr. Carlton Drake (Rhiz Ahmed), CEO of the Life Foundation. but manages to escape with help from the symbiote, which tears through the facility. Brock returns to San Francisco and is sheltered by Ann, testing his new powers. Mercenaries led by Roland Treece (Scott Haze) locate him, and captured Ann and their daughter to force Brock to surrender. Brock is taken back to the Life Foundation, where Drake wants to vivisect him.
The other symbiote they’ve collected escapes from containment and bonds with Treece, creating a bloodthirsty monster that kills Drake and attempts to kill Ann and her daughter. Brock becomes Venom to fight and ultimately kill Treece. Brock briefly reunites with Ann and their daughter, but realizes he’s no longer human and flees to learn how to control his powers and perhaps use them for the greater good.
Back at the Life Foundation, the symbiote that had bonded to Collins springs awaken and escapes in search of a new host (Carnage).