Those "free PDF" websites are notorious for hiding viruses. The file labeled Aldebaran_Tere_Liye_Full.pdf.exe is not a book—it is ransomware. Even standard PDFs can contain malicious scripts that hijack your browser or steal passwords.
It is common for readers to search for a PDF version of popular books for convenience. However, there are important things to consider:
If you are in Indonesia, the government’s iPusnas app (provided by Perpusnas) often has digital copies of Tere Liye’s works available for borrowing.
If you prefer reading digitally, you can legally purchase the eBook version through: