diff --git a/scripts/admin-test-env-modules/truck-appointments-contract.test.mjs b/scripts/admin-test-env-modules/truck-appointments-contract.test.mjs
index 3eeaab7a3..7c31f133c 100644
--- a/scripts/admin-test-env-modules/truck-appointments-contract.test.mjs
+++ b/scripts/admin-test-env-modules/truck-appointments-contract.test.mjs
@@ -2,7 +2,19 @@ import assert from 'node:assert/strict'
 import { readFileSync } from 'node:fs'
 import test from 'node:test'
 
-import { activeCustomerIdentity, inspectOceanBookingIdentity, platformWarehouseIdentity, truckAppointmentPayload } from './truck-appointments.mjs'
+import { activeCustomerIdentity, inspectOceanBookingIdentity, minimalPdfBytes, platformWarehouseIdentity, truckAppointmentPayload } from './truck-appointments.mjs'
+
+test('PDF upload fixtures contain real PDF magic bytes instead of MIME-only text', () => {
+  const bytes = minimalPdfBytes('RUN-2-DISPATCH_ORDER')
+  const content = Buffer.from(bytes).toString('ascii')
+  assert.equal(content.slice(0, 5), '%PDF-')
+  assert.match(content, /%%EOF\n$/)
+
+  const source = readFileSync(new URL('truck-appointments.mjs', import.meta.url), 'utf8')
+  assert.match(source, /new Blob\(\[minimalPdfBytes\(`\$\{context\.marker\}-BILL_OF_LADING`\)\], \{ type: 'application\/pdf' \}\)/)
+  assert.match(source, /new Blob\(\[minimalPdfBytes\(`\$\{context\.marker\}-DISPATCH_ORDER`\)\], \{ type: 'application\/pdf' \}\)/)
+  assert.doesNotMatch(source, /new Blob\(\[\s*`\$\{context\.marker\}-(?:BILL_OF_LADING|DISPATCH_ORDER)`\s*\], \{ type: 'application\/pdf' \}\)/)
+})
 
 test('booking prerequisite resolves an ACTIVE platform customer without fixture state', () => {
   assert.deepEqual(activeCustomerIdentity({ id: '21', tenantName: '现有客户' }),
diff --git a/scripts/admin-test-env-modules/truck-appointments.mjs b/scripts/admin-test-env-modules/truck-appointments.mjs
index 3fc3fae36..502eed3a5 100644
--- a/scripts/admin-test-env-modules/truck-appointments.mjs
+++ b/scripts/admin-test-env-modules/truck-appointments.mjs
@@ -14,6 +14,22 @@ function data(response) { return codeOf(response) === '200' ? response.body.data
 function failure(response) { return response?.http === 0 || response?.http >= 400 || (response?.http === 200 && codeOf(response) !== '200') }
 function records(value) { return Array.isArray(value) ? value : value?.records || [] }
 
+export function minimalPdfBytes(label = 'truck-appointment-fixture') {
+  const safeLabel = String(label).replace(/[^\x20-\x7E]/g, '_').slice(0, 64)
+  return new TextEncoder().encode(`%PDF-1.4
+% ${safeLabel}
+1 0 obj
+<< /Type /Catalog /Pages 2 0 R >>
+endobj
+2 0 obj
+<< /Type /Pages /Kids [] /Count 0 >>
+endobj
+trailer
+<< /Root 1 0 R >>
+%%EOF
+`)
+}
+
 export function platformWarehouseIdentity(item) {
   return { warehouseId: id(item?.warehouseId || item?.id || item?.warehouse?.id), platformTenantId: '0' }
 }
@@ -136,7 +152,7 @@ async function fixture(context) {
   const bookingId = id(created?.oceanBooking?.id); if (!bookingId) return null
   const form = new FormData(); form.append('expectedVersion', String(created.oceanBooking.version))
   form.append('documentType', 'BILL_OF_LADING')
-  form.append('file', new Blob([`${context.marker}-BILL_OF_LADING`], { type: 'application/pdf' }), `bill-${suffix}.pdf`)
+  form.append('file', new Blob([minimalPdfBytes(`${context.marker}-BILL_OF_LADING`)], { type: 'application/pdf' }), `bill-${suffix}.pdf`)
   const uploadResponse = await context.requestMultipart('POST', `${BOOKINGS}/${bookingId}/documents/upload`, form,
     context.token, { 'Idempotency-Key': `${context.marker}-truck-booking-file`.slice(0, 128) })
   const uploaded = context.apiSuccess(MODULE, '上传当前有效 BILL_OF_LADING 文件', uploadResponse, '', OPTIONS)
@@ -186,7 +202,7 @@ export async function run(context) {
       && !Object.hasOwn(appointment, 'customerId') && !Object.hasOwn(appointment, 'customerName'), '', OPTIONS)
   const path = `${TRUCKS}/${appointmentId}`
   const attachmentForm = new FormData(); attachmentForm.append('attachmentType', 'DISPATCH_ORDER')
-  attachmentForm.append('file', new Blob([`${context.marker}-DISPATCH_ORDER`], { type: 'application/pdf' }),
+  attachmentForm.append('file', new Blob([minimalPdfBytes(`${context.marker}-DISPATCH_ORDER`)], { type: 'application/pdf' }),
     `dispatch-order-${identity.suffix}.pdf`)
   const uploadAttachmentResponse = await context.requestMultipart('POST', `${path}/attachments/upload`,
     attachmentForm, context.token)