Malicious PDF — malware analysis report

Static analysis result for SHA-256 95136165bfef4597…

MALICIOUS

PDF

516.9 KB Created: 2010-02-23 12:29:53 -08:00 Authoring application: Adobe LiveCycle Designer ES 8.2 First seen: 2012-07-12
MD5: 71e7e9f8c1942eb331d00a86955d6870 SHA-1: 2a94245b989c390d745a7f423f7d5fa2ee63452a SHA-256: 95136165bfef4597d47c621e6f072249dfd13aa315a35d98f872614371e7fc41
294 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript and an embedded script payload, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_EMBEDDED_SCRIPT_PAYLOAD'. The ClamAV detection 'Pdf.Dropper.Agent-7284080-0' strongly suggests a dropper functionality. The embedded JavaScript is likely responsible for downloading and executing a secondary payload, a common technique for malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 13

  • Adobe Reader LibTIFF XFA image exploit — CVE-2010-0188 critical CVE likely CVE_2010_0188
    PDF contains the CVE-2010-0188 exploit template: XFA JavaScript heap-spray setup, a generated TIFF image payload, and assignment of that TIFF data to an XFA image field rawValue to trigger Adobe Reader's LibTIFF parser.
  • Flate image XObject contains x86 NOP sled high CVE related PDF_FLATE_IMAGE_NOP_SLED
    PDF embeds a FlateDecode image XObject whose decoded bytes are dominated by x86 NOP instructions, alongside form or embedded-file delivery structures. This is exploit payload staging evidence and is related to Adobe Reader parser-exploit families, but it is not a unique CVE fingerprint by itself.
  • ClamAV: Pdf.Dropper.Agent-7284080-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7284080-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • PDF embedded file could not be fully decoded medium PDF_EMBEDDED_FILE_UNDECODED
    A declared PDF /EmbeddedFile stream uses filters that the scanner could not decode. The raw stream was carved for artifact triage because malformed or unsupported attachment filters can hide payload content from normal extraction.
  • Suspicious extracted artifact medium 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.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.
  • 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/xhtml In PDF document text
    • http://www.xfa.org/schema/xfa-data/1.0/Referenced by PDF JavaScript
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/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://ns.adobe.com/xdp/Referenced by PDF JavaScript
    • http://www.xfa.org/schema/xci/1.0/Referenced by PDF JavaScript
    • http://www.xfa.org/schema/xfa-template/2.4/Referenced by PDF JavaScript
    • http://www.xfa.org/schema/xfa-locale-set/2.7/Referenced by PDF JavaScript
    • http://www.xfa.org/schema/xfa-locale-set/2.1/Referenced by PDF JavaScript
    • http://www.xfa.org/schema/xfa-form/2.8/Referenced by PDF JavaScript
    • http://ns.adobe.com/xtd/In PDF document text
🗂 Part of campaign: shared payload c920f05ae7 52 samples

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 13

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0002.bin pdf-embedded-file PDF EmbeddedFile object 2 at offset 0x56 85 bytes
SHA-256: c06dcd026a7ea0536b63e07ce688691b585339a3ab7ff59065e546b56308c7bb
embedded_file_obj0003.bin pdf-embedded-file PDF EmbeddedFile object 3 at offset 0x108 1466 bytes
SHA-256: 0cae1494b9c99505bf126e683a1a8be36bc8d5e793ab829e266d6e2fd62ccac3
embedded_file_obj0004.bin pdf-embedded-file PDF EmbeddedFile object 4 at offset 0x3C7 5876 bytes
SHA-256: 92971a71a04e4614036b4acd9c5b38c4c30b736966c6bc5afee48aa898eb287e
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
embedded_file_obj0005.bin pdf-embedded-file PDF EmbeddedFile object 5 at offset 0xF6B 11740 bytes
SHA-256: f47c3dc8c4eeb64abc2cc332be719add15af6ce6dfdcdb477c08a1aefdbe7477
embedded_file_obj0006.bin pdf-embedded-file PDF EmbeddedFile object 6 at offset 0x1133 2928 bytes
SHA-256: 226eeacc5eecef2a05ca480f144ff6936594e20b5c7672e8f29f25c8bea65a56
embedded_file_obj0007.bin pdf-embedded-file PDF EmbeddedFile object 7 at offset 0x14A0 200 bytes
SHA-256: 4cb349134bdb5f1a1c03281df9b53128ebe947f235398a912a4f0a9f638b24d5
embedded_file_obj0008.bin pdf-embedded-file PDF EmbeddedFile object 8 at offset 0x1593 835 bytes
SHA-256: d51b9fc28b592405fb598e711d1495e1421571073bc2e8542d55389768716c06
embedded_file_obj0009.bin pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x176C 291 bytes
SHA-256: e65f1e07bc965092b3153e64a1e8777a909cc47a98c0e2a10d38c47def2e6652
regedit.exe pdf-embedded-file-undecodable PDF EmbeddedFile object 13 at offset 0x1989; filter decode failed 61056 bytes
SHA-256: c920f05ae7adbc0f193e0a2843d05caf265d7fdb85984056e5da1b1c7bef46c0
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 8.00, consistent with packed or encrypted content.
javascript_obj0047_000.js pdf-javascript-stream PDF /JS object 47 at offset 0x12A04 1532 bytes
SHA-256: f574e4d51594d1a8fd22e125b109b827c437aa898edc78babb62dbb93f8744f8
Preview script
First 1,000 lines of the extracted script
if (typeof(xfa_installed) == "undefined" || typeof(xfa_version) == "undefined" || xfa_version < 2.1)
{
   if (app.viewerType == "Reader")
   {
      if (ADBE.Reader_Value_Asked != true)
      {
         if (app.viewerVersion < 6.0)
         {
            if (app.alert(ADBE.Viewer_Form_string_Reader_5x, 1, 1) == 1)
               this.getURL(ADBE.Reader_Value_New_Version_URL + ADBE.SYSINFO, false);
            ADBE.Reader_Value_Asked = true;
         }
         else if (app.viewerVersion < 7.0)
         {
            if (app.alert(ADBE.Viewer_Form_string_Reader_601, 1, 1) == 1)
               app.findComponent({cType:"App", cName:"Reader7", cDesc: ADBE.Viewer_string_Update_Reader_Desc});
            ADBE.Reader_Value_Asked = true;
         }
         else
         {
            if (app.alert(ADBE.Viewer_Form_string_Reader_6_7x, 1, 1) == 1)
               app.findComponent({cType:"Plugin", cName:"XFA", cDesc: ADBE.Viewer_string_Update_Reader_Desc});
            ADBE.Reader_Value_Asked = true;
         }
      }
   }
   else
   {
      if (ADBE.Viewer_Value_Asked != true)
      {
         if (app.viewerVersion < 7.0)
            app.response({cQuestion: ADBE.Viewer_Form_string_Viewer_Older, cDefault: ADBE.Viewer_Value_New_Version_URL + ADBE.SYSINFO, cTitle: ADBE.Viewer_string_Title});
         else if (app.alert(ADBE.Viewer_Form_string_Viewer, 1, 1) == 1)
            app.findComponent({cType:"Plugin", cName:"XFA", cDesc: ADBE.Viewer_string_Update_Desc});
         ADBE.Viewer_Value_Asked = true;
      }
   }
}
javascript_obj0048_001.js pdf-javascript-stream PDF /JS object 48 at offset 0x12BEF 870 bytes
SHA-256: 4a1aca004cf20431c9a66dce85404a6411a54d881a6c257882260ffc972a13eb
Preview script
First 1,000 lines of the extracted script
if (typeof(ADBE.Reader_Value_Asked) == "undefined")
   ADBE.Reader_Value_Asked = false;
if (typeof(ADBE.Viewer_Value_Asked) == "undefined")
   ADBE.Viewer_Value_Asked = false;
if (typeof(ADBE.Reader_Need_Version) == "undefined" || ADBE.Reader_Need_Version < 7.0)
{
   ADBE.Reader_Need_Version = 7.0;
   ADBE.Reader_Value_New_Version_URL = "http://cgi.adobe.com/special/acrobat/update";
   ADBE.SYSINFO = "?p=" + app.platform + "&v=" + app.viewerVersion + "&l=" + app.language + "&c=" + app.viewerType + "&w=" + "XFA1_6";
}
if (typeof(ADBE.Viewer_Need_Version) == "undefined" || ADBE.Viewer_Need_Version < 7.0)
{
   ADBE.Viewer_Need_Version = 7.0;
   ADBE.Viewer_Value_New_Version_URL = "http://cgi.adobe.com/special/acrobat/update";
   ADBE.SYSINFO = "?p=" + app.platform + "&v=" + app.viewerVersion + "&l=" + app.language + "&c=" + app.viewerType + "&w=" + "XFA1_6";
}
javascript_obj0049_002.js pdf-javascript-stream PDF /JS object 49 at offset 0x12D49 2795 bytes
SHA-256: 826c5622c798d67e5281cca7e05933dddc90ccdcb0a6177c9f7d06f11bef8f7f
Preview script
First 1,000 lines of the extracted script
if (typeof(this.ADBE) == "undefined")
   this.ADBE = new Object();
ADBE.LANGUAGE = "ENU";
ADBE.Viewer_string_Title = "Adobe Acrobat";
ADBE.Viewer_string_Update_Desc = "Adobe Interactive Forms Update";
ADBE.Viewer_string_Update_Reader_Desc = "Adobe Reader 7.0.5";
ADBE.Reader_string_Need_New_Version_Msg = "This PDF file requires a newer version of Adobe Reader. Press OK to download the latest version or see your system administrator.";
ADBE.Viewer_Form_string_Reader_601 = "This PDF form requires a newer version of Adobe Reader. Although the form may appear to work properly, some elements may function improperly or may not appear at all. Press OK to initiate an online update or see your system administrator.";
ADBE.Viewer_Form_string_Reader_Older = "This PDF form requires a newer version of Adobe Reader. Although the form may appear to work properly, some elements may function improperly or may not appear at all. Press OK for online download information or see your system administrator.";
ADBE.Viewer_Form_string_Viewer_601 = "This PDF form requires a newer version of Adobe Acrobat. Although the form may appear to work properly, some elements may function improperly or may not appear at all. Press OK to initiate an online update or see your system administrator.";
ADBE.Viewer_Form_string_Viewer_60 = "This PDF form requires a newer version of Adobe Acrobat. Although the form may appear to work properly, some elements may function improperly or may not appear at all. For more information please copy the following URL (CTRL+C on Win, Command-C on Mac) and paste into your browser or see your system administrator.";
ADBE.Viewer_Form_string_Viewer_Older = "This PDF requires a newer version of Acrobat. Copy this URL and paste into your browser or see your sys admin.";
ADBE.Viewer_Form_string_Reader_5x = "This PDF form requires a newer version of Adobe Reader. Without a newer version, the form may be displayed, but it might not work properly. Some form elements might not be visible at all. If an internet connection is available, clicking OK will open your browser to a web page where you can obtain the latest version.";
ADBE.Viewer_Form_string_Reader_6_7x = "This PDF form requires a newer version of Adobe Reader. Without a newer version, the form may be displayed, but it might not work properly. Some form elements might not be visible at all. If an internet connection is available, clicking OK will download and install the latest version.";
ADBE.Viewer_Form_string_Viewer = "This PDF form requires a newer version of Adobe Acrobat. Without a newer version, the form may be displayed, but it might not work properly. Some form elements might not be visible at all. If an internet connection is available, clicking OK will download and install the latest version.";
xfa_image_rawvalue_000.tif pdf-xfa-image-tiff XFA image/rawValue TIFF payload near offset 0xFFD 8538 bytes
SHA-256: 671a354149e0ee431b9ab639739547a82c1110f751869622d000c6e04bf7d45f
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis found candidate code region(s). Indicators: NOP sled, heap spray 0x0C

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