diff --git a/ddmock/src/main/java/com/dd/DDMock.kt b/ddmock/src/main/java/com/dd/DDMock.kt
index c4cf099..7ed36c4 100644
--- a/ddmock/src/main/java/com/dd/DDMock.kt
+++ b/ddmock/src/main/java/com/dd/DDMock.kt
@@ -6,6 +6,7 @@ import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
 import okhttp3.HttpUrl
+import okhttp3.MediaType
 import okio.Buffer
 import java.io.IOException
 import java.util.regex.Pattern
@@ -35,10 +36,11 @@ object DDMock {
             } else {
                 val fullFilePath = "$path/$file"
                 val key = path.replace(MOCK_FILE_DIRECTORY, "")
+                val extension = fullFilePath.split("/", ".").last()
                 if (result.contains(key)) {
                     result[key]?.files?.add(fullFilePath)
                 } else {
-                    result[key] = com.dd.MockEntry(key, arrayListOf(fullFilePath))
+                    result[key] = com.dd.MockEntry(key, arrayListOf(fullFilePath), mediaType = getMediaType(extension))
                 }
             }
         }
@@ -63,6 +65,14 @@ object DDMock {
         return mockEntry ?: getRegexEntry(path)
     }
 
+    private fun getMediaType(extension: String): MediaType? {
+        when (extension) {
+            "json" -> return MediaType.parse(MockEntry.CONTENT_TYPE_APPLICATION_JSON)
+            "pdf" -> return MediaType.parse(MockEntry.CONTENT_TYPE_APPLICATION_PDF)
+        }
+        return MediaType.parse(MockEntry.CONTENT_TYPE_APPLICATION_JSON)
+    }
+
     private fun getRegexEntry(path: String): MockEntry? {
         for (key in mockEntries.keys) {
             if (key.contains("{")) {
diff --git a/ddmock/src/main/java/com/dd/MockEntry.kt b/ddmock/src/main/java/com/dd/MockEntry.kt
index 32bf683..b1d1b3c 100644
--- a/ddmock/src/main/java/com/dd/MockEntry.kt
+++ b/ddmock/src/main/java/com/dd/MockEntry.kt
@@ -3,7 +3,7 @@ package com.dd
 import okhttp3.MediaType
 import java.net.HttpURLConnection
 
-internal const val CONTENT_TYPE_APPLICATION_JSON = "application/json; charset=utf-8"
+
 private const val DEFAULT_MOCK_RESPONSE_DELAY_MS = 400L
 
 class MockEntry(
@@ -11,7 +11,11 @@ class MockEntry(
         val files: ArrayList<String>,
         var selectedFile: Int = 0,
         var statusCode: Int = HttpURLConnection.HTTP_OK,
-        var responseTime: Long = DEFAULT_MOCK_RESPONSE_DELAY_MS
+        var responseTime: Long = DEFAULT_MOCK_RESPONSE_DELAY_MS,
+        var mediaType: MediaType?
 ) {
-    val mediaType = MediaType.parse(CONTENT_TYPE_APPLICATION_JSON)
+        companion object {
+                const val CONTENT_TYPE_APPLICATION_JSON = "application/json; charset=utf-8"
+                const val CONTENT_TYPE_APPLICATION_PDF = "application/pdf; charset=utf-8"
+        }
 }
\ No newline at end of file
diff --git a/ddmock/src/main/java/com/dd/MockInterceptor.kt b/ddmock/src/main/java/com/dd/MockInterceptor.kt
index ab601dc..920c64d 100644
--- a/ddmock/src/main/java/com/dd/MockInterceptor.kt
+++ b/ddmock/src/main/java/com/dd/MockInterceptor.kt
@@ -36,7 +36,7 @@ class MockInterceptor : Interceptor {
             .message("MOCK")
             .header(
                 "Content-Type",
-                if (mockEntry.mediaType != null) mockEntry.mediaType.toString() else CONTENT_TYPE_APPLICATION_JSON
+                if (mockEntry.mediaType != null) mockEntry.mediaType.toString() else MockEntry.CONTENT_TYPE_APPLICATION_JSON
             )
             .request(request)
             .body(ResponseBody.create(mockEntry.mediaType, buffer.size(), buffer))