The 1540 date is tricky. The first complete French Bible printed in Geneva was likely Robert Estienne (Stephanus) ’s edition of 1553. However, 1540 marks the period of the Olivétan Bible (1535) reprints. It is highly probable that the "1540 Sword Bible" refers to a specific reprint of the Olivétan translation, bound with a distinctive metal clasp or a woodcut title page depicting a sword. Why the "Sword"? The nickname "The Sword Bible" does not imply violence. It is a direct reference to Ephesians 6:17 : "Take the helmet of salvation and the sword of the Spirit, which is the word of God."
Holding (or viewing) a digital scan of such a Bible is looking into the engine room of Western democracy. The marginal notes in these Geneva Bibles eventually influenced the English Puritans, the Mayflower pilgrims, and the American Declaration of Independence. You will likely not find a file specifically named "la bible de l'epee geneve 1540 pdf" because that is a modern search tag. However, the Geneva Bible (Olivétan/Estienne) from 1540-1560 absolutely exists in digital form.
Visit the Gallica (BnF) or e-rara portals. Search for "Bible. Français. 1540."