diff --git a/resources/gif-animated.GIF_Animated-macos-14_arm64_libvips-8.15.3.golden.gif b/resources/gif-animated.GIF_Animated-macos-14_arm64_libvips-8.15.3.golden.gif
new file mode 100644
index 00000000..857cacd5
Binary files /dev/null and b/resources/gif-animated.GIF_Animated-macos-14_arm64_libvips-8.15.3.golden.gif differ
diff --git a/resources/gif-animated.GIF_Animated_ExportNative-macos-14_arm64_libvips-8.15.3.golden.gif b/resources/gif-animated.GIF_Animated_ExportNative-macos-14_arm64_libvips-8.15.3.golden.gif
new file mode 100644
index 00000000..aa5ac10b
Binary files /dev/null and b/resources/gif-animated.GIF_Animated_ExportNative-macos-14_arm64_libvips-8.15.3.golden.gif differ
diff --git a/vips/foreign.go b/vips/foreign.go
index 80f643b4..861f076d 100644
--- a/vips/foreign.go
+++ b/vips/foreign.go
@@ -154,14 +154,14 @@ func DetermineImageType(buf []byte) ImageType {
 		return ImageTypeHEIF
 	} else if isSVG(buf) {
 		return ImageTypeSVG
-	} else if isPDF(buf) {
-		return ImageTypePDF
 	} else if isBMP(buf) {
 		return ImageTypeBMP
 	} else if isJP2K(buf) {
 		return ImageTypeJP2K
 	} else if isJXL(buf) {
 		return ImageTypeJXL
+	} else if isPDF(buf) {
+		return ImageTypePDF
 	} else {
 		return ImageTypeUnknown
 	}
@@ -240,7 +240,7 @@ func isSVG(buf []byte) bool {
 var pdf = []byte("\x25\x50\x44\x46")
 
 func isPDF(buf []byte) bool {
-	return bytes.HasPrefix(buf, pdf)
+	return bytes.Contains(buf[:1024], pdf)
 }
 
 var bmpHeader = []byte("BM")