1 source 1h ago
Calif Demos iPhone Hacking By Opening A PDF File
Calif is claiming a one-tap exploit that works through both third-party and native iPhone messaging apps, which is a narrower attack path than the usual chain of separate bugs.
Reporting from 1 source: GIGAZINE.
A California-based hacker team called Calif says it can hack an iPhone by sending a PDF file through Signal or iMessage and getting the target to open it. Calif showed the attack at Hexacon in Paris on October 16, 2026. One member said technical details will be published in the coming weeks. Calif says it has reported nearly 100 bugs to Apple since the start of 2026 and has received no bounty or compensation.
Calif presented the method at Hexacon, a security conference in Paris, on October 16, 2026. Recorded demos show a PDF opened from a Signal message and from iMessage, with the Calif logo moving around the screen after a tap.
The group also reported a jailbreak of iOS 27.0.1 that persists after the iPhone is powered off and restarted, and a jailbreak of the iPhone Duo. Calif security researcher Stephan Esser told the German outlet Heise there are no plans to release a jailbreak tool for end users, though a proof of concept may come soon.
Written with AI by Yomimono from the 1 cited source below, including Japanese-language reporting where cited. See our editorial policy.
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Sources
- GIGAZINE iPhoneからPDFファイルを開くだけでハッキングすることに成功