Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d2a7e23821743b…

MALICIOUS

PDF

315.9 KB Created: 2011-01-24 11:12:14 -05:00 Authoring application: Adobe Designer 7.0 First seen: 2012-10-11
MD5: 51d7d84f7bb4ac036a96a6603416ed85 SHA-1: 81cd668e43e0f60fadd4056e6148b387082dc1bc SHA-256: 86d2a7e23821743bb3f9553313b47fa54dc7390819959d828a27e3c2499687ed
68 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript that displays a fake Adobe Reader update prompt, directing the user to download a file from a specific URL. This script is designed to lure users into downloading potentially malicious content disguised as a legitimate software update. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • 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
  • 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/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/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/2.2/Referenced by PDF JavaScript
    • http://www.xfa.org/schema/xfa-template/2.1/Referenced by PDF JavaScript
    • http://www.xfa.org/schema/xfa-data/1.0/Referenced by PDF JavaScript
    • http://www.w3.org/1999/xhtmlReferenced by PDF JavaScript
    • 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 10

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0045.bin pdf-embedded-file PDF EmbeddedFile object 45 at offset 0x2B24E 85 bytes
SHA-256: c06dcd026a7ea0536b63e07ce688691b585339a3ab7ff59065e546b56308c7bb
embedded_file_obj0046.bin pdf-embedded-file PDF EmbeddedFile object 46 at offset 0x2B300 1656 bytes
SHA-256: 45f9f2b3e1ce396ed9fe7a8d06e50f6dff9aca7265ffcc790b9e91fa6ed8e0e9
embedded_file_obj0047.bin pdf-embedded-file PDF EmbeddedFile object 47 at offset 0x2B5F6 1514778 bytes
SHA-256: c996d2199371a395b7e1b43dac63c45a083fcbf1597856571601059d108964b6
embedded_file_obj0048.bin pdf-embedded-file PDF EmbeddedFile object 48 at offset 0x4DB49 212 bytes
SHA-256: 57045217c453d4674a08ad8778674bf199a7989a9505424a1815c016e6bb412f
embedded_file_obj0049.bin pdf-embedded-file PDF EmbeddedFile object 49 at offset 0x4DC40 143 bytes
SHA-256: 26a4e282859eb1f92eda3385d9607593aeb9a415c13975eca677417e4ce0dbbe
javascript_obj0037_000.js pdf-javascript-stream PDF /JS object 37 at offset 0x2AAD7 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_obj0039_001.js pdf-javascript-stream PDF /JS object 39 at offset 0x2AC5B 2794 bytes
SHA-256: 4e139c8b22ec16bd5aa51575c80dec2bbf89b76977a06b68473031a0eb206366
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";
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_7x = "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.";
javascript_obj0041_002.js pdf-javascript-stream PDF /JS object 41 at offset 0x2AF4A 1528 bytes
SHA-256: c876171bd867b66b7671fb337ff9e57d18cd15b43d344cf5a7243821300a408a
Preview script
First 1,000 lines of the extracted script
if (typeof(xfa_installed) == "undefined" || typeof(xfa_version) == "undefined" || xfa_version < 2.0)
{
   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_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_7x, 1, 1) == 1)
            app.findComponent({cType:"Plugin", cName:"XFA", cDesc: ADBE.Viewer_string_Update_Desc});
         ADBE.Viewer_Value_Asked = true;
      }
   }
}
font_00_cff_off00001174.bin pdf-font-stream PDF embedded font (cff) at offset 0x1174 67274 bytes
SHA-256: 19bc268243419390efbe4d4a72616ba894a394856f2c9ca5fc68f8c8c3d28328
font_01_cff_off0000d279.bin pdf-font-stream PDF embedded font (cff) at offset 0xD279 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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