Yeah, lockdown mode might have handled it. If I'm reading the article right, the first step of the exploit was a PDF file sent with iMessage. When I tried out

Yeah, lockdown mode might have handled it. If I'm reading the article right, the first step of the exploit was a PDF file sent with iMessage. When I tried out lockdown mode out of curiousity, I found that it was aggressive about blocking PDF viewing. I quickly bailed on it because I often read research papers on the web, and it switched them from view to download.