Malicious PDF — malware analysis report

Static analysis result for SHA-256 01d658190ae4dbd3…

MALICIOUS

PDF

279.2 KB Created: 2004-09-30 17:04:10 +09:00 Authoring application: Adobe Designer 7.0 First seen: 2018-05-08
MD5: d1984dbf67799c2e34e4f4444a53bfec SHA-1: d410a9dad6ed6d9d3e5404af3131dbe7fddeddea SHA-256: 01d658190ae4dbd3db8866c6d9d3853b8e1e16b2353217a50ed62934f51752cf
176 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains XFA forms and embedded JavaScript, which are flagged as risky. The JavaScript code constructs messages and prompts that mimic Adobe Reader/Acrobat update notifications. The primary goal appears to be social engineering the user into visiting the URL http://cgi.adobe.com/special/acrobat/update to download a malicious payload disguised as a legitimate update.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9334

Heuristics 10

  • XFA form contains risky executable script high CVE related PDF_XFA_SCRIPT
    PDF embeds an XFA form whose script block contains exploit, submission/launch, or shell-execution primitives. Ordinary LiveCycle print/update scripts are left as generic XFA/JS signals unless stronger behavior is present.
  • JavaScript action low 2 related findings PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • Embedded script payload in PDF stream info PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.w3.org/1999/02/22-rdf-syntax-ns# In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://cgi.adobe.com/special/acrobat/updateReferenced by PDF JavaScript
    • http://www.xfa.org/schema/xfa-template/2.1/Referenced by PDF JavaScript
    • http://www.xfa.org/schema/xfa-template/2.2/Referenced by PDF JavaScript
    • http://www.w3.org/1999/xhtmlReferenced by PDF JavaScript
    • http://www.xfa.org/schema/xfa-data/1.0/Referenced by PDF JavaScript
    • http://ns.adobe.com/xdp/In PDF document text
    • http://www.xfa.org/schema/xci/1.0/In PDF document text
    • http://ns.adobe.com/xfdf/In PDF document text
    • http://ns.adobe.com/xtd/In PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 12

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0415.bin pdf-embedded-file PDF EmbeddedFile object 415 at offset 0x3FD08 85 bytes
SHA-256: c06dcd026a7ea0536b63e07ce688691b585339a3ab7ff59065e546b56308c7bb
embedded_file_obj0416.bin pdf-embedded-file PDF EmbeddedFile object 416 at offset 0x3FDBB 1460 bytes
SHA-256: f109609a93df51dd429080fcea4ee57ee0645e82578bc79b32711bfb7b48de01
embedded_file_obj0417.bin pdf-embedded-file PDF EmbeddedFile object 417 at offset 0x4009D 78551 bytes
SHA-256: 7c455378a9972ca01ee0fb008a71fe1ec5978b81309124458716b07988023d7e
embedded_file_obj0418.bin pdf-embedded-file PDF EmbeddedFile object 418 at offset 0x42767 1187 bytes
SHA-256: 266158cfbb7a42f2e215feb06800ea0910930e8093e8d6c5643570e6db351661
embedded_file_obj0419.bin pdf-embedded-file PDF EmbeddedFile object 419 at offset 0x42995 765 bytes
SHA-256: 9708462c0407442fc80b1370df81a02dc9eb16aad8c8c746a3ce9ff7372b72b5
embedded_file_obj0420.bin pdf-embedded-file PDF EmbeddedFile object 420 at offset 0x42B8D 85 bytes
SHA-256: a60265344cf1a9e94da34c8f587f64a4297e2fa417c895852209903ab7588bcc
embedded_file_obj0421.bin pdf-embedded-file PDF EmbeddedFile object 421 at offset 0x42C39 212 bytes
SHA-256: 57045217c453d4674a08ad8778674bf199a7989a9505424a1815c016e6bb412f
javascript_obj0407_000.js pdf-javascript-stream PDF /JS object 407 at offset 0x3F56B 422 bytes
SHA-256: 3fe3331414779367c1decc601653e8c35f6028fab9ce092c46764fc4733ff07b
Preview script
First 1,000 lines of the extracted script
this.ADBE = new Object();
ADBE.SYSINFO = "?p="+app.platform+"&v="+app.viewerVersion+"&l="+app.language+"&c="+app.viewerType;
ADBE_Reader_Value_Asked = false;
ADBE_Viewer_Value_Asked = false;
ADBE.Reader_Value_New_Version_URL = "http://cgi.adobe.com/special/acrobat/update";
ADBE.Reader_Need_Version = 6.01;
ADBE.Viewer_Value_New_Version_URL = "http://cgi.adobe.com/special/acrobat/update";
ADBE.Viewer_Need_Version = 6.01;
javascript_obj0409_001.js pdf-javascript-stream PDF /JS object 409 at offset 0x3F6B9 3432 bytes
SHA-256: e31b05aa8ed6457f9d914011534d4280a5c5a77022a024018b5f5e053fc7bb36
Preview script
First 1,000 lines of the extracted script
ADBE.LANGUAGE = "ENU";
ADBE.Viewer_string_Title = "Adobe Acrobat";
ADBE.Viewer_string_Update_Desc = "Adobe Acrobat - Reader 6.0.2 업데이트";
ADBE.Reader_string_Need_New_Version_Msg = "이 PDF 파일을 보려면 최신 버전의 Adobe Reader가 필요합니다. [확인]을 눌러 최신 버전을 다운로드하거나 시스템 관리자에게 문의하십시오.";
ADBE.Viewer_Form_string_Reader_601 = "이 PDF 형식에는 최신 버전의 Adobe Reader가 필요합니다. 겉으로는 제대로 작동하는 것처럼 보이나 실제로는 일부 요소가 제대로 작동하지 않거나 아예 나타나지 않을 수 있습니다. [확인]을 눌러 온라인 업데이트를 초기화하거나 시스템 관리자에게 문의하십시오.";
ADBE.Viewer_Form_string_Reader_Older = "이 PDF 형식에는 최신 버전의 Adobe Reader가 필요합니다. 겉으로는 제대로 작동하는 것처럼 보이나 실제로는 일부 요소가 제대로 작동하지 않거나 아예 나타나지 않을 수 있습니다. [확인]을 눌러 온라인 다운로드 정보를 보거나 시스템 관리자에게 문의하십시오.";
ADBE.Viewer_Form_string_Viewer_601 = "이 PDF 형식에는 최신 버전의 Adobe Acrobat이 필요합니다. 겉으로는 제대로 작동하는 것처럼 보이나 실제로는 일부 요소가 제대로 작동하지 않거나 아예 나타나지 않을 수 있습니다. [확인]을 눌러 온라인 업데이트를 초기화하거나 시스템 관리자에게 문의하십시오.";
ADBE.Viewer_Form_string_Viewer_60 = "이 PDF 형식에는 최신 버전의 Adobe Acrobat이 필요합니다. 겉으로는 제대로 작동하는 것처럼 보이나 실제로는 일부 요소가 제대로 작동하지 않거나 아예 나타나지 않을 수 있습니다. 자세한 내용은 다음 URL을 복사하여(Win에서는 CTRL+C , Mac에서는 Command-C) 브라우저에 붙여넣거나 시스템 관리자에게 문의하십시오.";
ADBE.Viewer_Form_string_Viewer_Older = "이 PDF 형식에는 최신 버전의 Adobe Acrobat이 필요합니다. 이 URL을 복사하여 브라우저에 붙여넣거나  시스템 관리자에게 문의하십시오.";
ADBE.Viewer_Form_string_Reader_5x = "이 PDF 형식에는 최신 버전의 Adobe Reader가 필요합니다. 최신 버전이 없을 경우 양식이 표시되더라도 제대로 작동하지 않을 수 있습니다. 일부 양식 요소는 아예 보이지 않을 수도 있습니다. 인터넷에 연결되어 있는 경우 [확인]을 누르면 최신 버전을 구할 수 있는 웹 페이지가 브라우저에 나타납니다.";
ADBE.Viewer_Form_string_Reader_6_7x = "이 PDF 형식에는 최신 버전의 Adobe Reader가 필요합니다. 최신 버전이 없을 경우 양식이 표시되더라도 제대로 작동하지 않을 수 있습니다. 일부 양식 요소는 아예 보이지 않을 수도 있습니다. 인터넷에 연결되어 있는 경우 [확인]을 누르면 최신 버전이 다운로드되어 설치됩니다.";
ADBE.Viewer_Form_string_Viewer_7x = "이 PDF 형식에는 최신 버전의 Adobe Acrobat이 필요합니다. 최신 버전이 없을 경우 양식이 표시되더라도 제대로 작동하지 않을 수 있습니다. 일부 양식 요소는 아예 보이지 않을 수도 있습니다. 인터넷에 연결되어 있는 경우 [확인]을 누르면 최신 버전이 다운로드되어 설치됩니다.";
javascript_obj0411_002.js pdf-javascript-stream PDF /JS object 411 at offset 0x3FA11 1552 bytes
SHA-256: b950d0d3a9a89972a1c31c3f348f499c10deb7b73ec3e56c8302fc1faa40e7d0
Preview script
First 1,000 lines of the extracted script
if (typeof(xfa_installed) == "undefined" || typeof(xfa_version) == "undefined" || xfa_version < 1.2)
{
   if (app.viewerType == "Reader")
   {
      if (ADBE_Reader_Value_Asked != true)
      {
         if (app.viewerVersion == 6.01)
         {
            if (app.alert(ADBE.Viewer_Form_string_Reader_601, 1, 1) == 1)
               app.findComponent({cType:"UDPatch", cName:"602Patch", cDesc: ADBE.Viewer_string_Update_Desc});
         }
         else if (app.viewerVersion < 6.01)
         {
            if (app.alert(ADBE.Viewer_Form_string_Reader_Older, 1, 1) == 1)
               this.getURL(ADBE.Reader_Value_New_Version_URL + ADBE.SYSINFO, false);
         }
         ADBE_Reader_Value_Asked = true;
      }
   }
   else
   {
      if (ADBE_Viewer_Value_Asked != true)
      {
         if (app.viewerVersion == 6.01)
         {
            if (app.alert(ADBE.Viewer_Form_string_Viewer_601, 1, 1) == 1)
               app.findComponent({cType:"UDPatch", cName:"602Patch", cDesc: ADBE.Viewer_string_Update_Desc});
         }
         else if (app.viewerVersion == 6)
         {
            app.response({cQuestion: ADBE.Viewer_Form_string_Viewer_60, cDefault: ADBE.Viewer_Value_New_Version_URL + ADBE.SYSINFO, cTitle: ADBE.Viewer_string_Title});
         }
         else if (app.viewerVersion < 6)
         {
            app.response({cQuestion: ADBE.Viewer_Form_string_Viewer_Older, cDefault: ADBE.Viewer_Value_New_Version_URL + ADBE.SYSINFO, cTitle: ADBE.Viewer_string_Title});
         }
         ADBE_Viewer_Value_Asked = true;
      }
   }
}
font_00_cff_off000022ff.bin pdf-font-stream PDF embedded font (cff) at offset 0x22FF 67274 bytes
SHA-256: 19bc268243419390efbe4d4a72616ba894a394856f2c9ca5fc68f8c8c3d28328
font_02_cff_off0001aff1.bin pdf-font-stream PDF embedded font (cff) at offset 0x1AFF1 64586 bytes
SHA-256: 96161e3d15cf67591ef2a1c87940c8dc0af59a94fcfab5d6bfcf4cb992a24af8
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.45, consistent with packed or encrypted content.

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