Use Xodo or Microsoft Word instead. They are legal, safe, and surprisingly powerful.
Run a malware scan (Malwarebytes), change any passwords entered on the device, and uninstall it. Then get the official Foxit from Google Play. Foxit PDF Reader Editor Apk Mod
Overall Rating: ⭐⭐⭐☆☆ (3/5) Great features if it works, but significant security and stability trade-offs. Use Xodo or Microsoft Word instead