The description for the item Paralyzation dust reads...
"It is unknown who first made this dust. When sprinkled on someone it causes the victim to become paralyzed."
Setting aside the lack of imagination in the description, the item properties are Hold Monster. "Someone" implies a person, or more accurately a humanoid, not something with a Monster template. Also "victim" is not really a term that would be used for a Monster. If this was Hold Person, then it would be accurate. As a suggestion for an alternative below, that doesn't imply that the item is from any particular campaign setting, nor does it suggest a specific origin.
Throughout the dense woodlands, rocky mountain, festering swamps, or scorching desserts; paralysation dust can be found in the pockets and pouches of the lowliest of adventurer, to the most prestigious of monster hunters. Paralysation dust is a reliable means of evening the odds of what could be a precarious fight, for even the most skilled, or indeed fortunate of individuals, ensuring that fights end in favourable terms of those who hedge their bets by way of using this seemingly innocuous of substance.