diff --git a/src/main/capabilities/office-file-extended.ts b/src/main/capabilities/office-file-extended.ts
index d700ea5..d6dcec6 100644
--- a/src/main/capabilities/office-file-extended.ts
+++ b/src/main/capabilities/office-file-extended.ts
@@ -224,7 +224,8 @@ register("Excel_Cs_CopyV2", async (_ctx, node, args) => {
 });
 
 function parsePdfPages(raw: string, pageCount: number): number[] {
-  if (!raw.trim()) return Array.from({ length: pageCount }, (_, index) => index);
+  // 页码留空时返回空集：由调用方抛出「No valid PDF pages」，避免静默复制全本
+  if (!raw.trim()) return [];
   const pages = new Set<number>();
   for (const value of parseList(raw, Number)) if (value >= 1 && value <= pageCount) pages.add(value - 1);
   return [...pages];