The is a special invisible character (Unicode U+202E ) used in coding to reverse the order of the characters that follow it. Here is how the trick happened:
When Elena double-clicked the file, her computer didn't open a PDF reader. Instead, it saw the .exe extension and ran the code. executare_silita_an‮fdp.exe
Elena was worried. She knew she was up to date on her taxes, but the name "pdf" at the end of the file gave her a sense of security. She clicked "Download." The Optical Illusion: The RTLO Trick The is a special invisible character (Unicode U+202E
To Elena’s eyes, the file looked like a harmless PDF: executare_silita_anfdp.pdf . The Execution executare_silita_an‮fdp.exe