Malicious PDF — malware analysis report

Static analysis result for SHA-256 f29fcdae1cbe6c54…

MALICIOUS

PDF

25.4 KB Created: 2013-04-03 22:13:09 +04:00 Authoring application: Adobe Designer 7.0
MD5: 38ffcc09d4eea4bd9e2a70da261bfe00 SHA-1: 284b5d1d457a8f98fad4d5578959638b4aa70bc0 SHA-256: f29fcdae1cbe6c5490839dedda27bc17f272c333bd0d700dd8cb2e901956f6d6
130 Risk Score

Malware Insights

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

The PDF file contains multiple embedded JavaScript streams and embedded files, strongly indicating a malicious intent. The high-confidence heuristics 'PDF_XFA_SCRIPT' and 'ML_NYX_PDF_MALICIOUS' confirm this. The embedded JavaScript is likely responsible for downloading and executing a secondary payload, a common technique for initial access and further infection. The specific nature of the payload could not be determined due to obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • Embedded script payload in PDF stream medium 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.
  • JavaScript action low 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 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#
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 9

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0027.bin
c06dcd026a7ea0536b63e07ce688691b585339a3ab7ff59065e546b56308c7bb		 pdf-embedded-file PDF EmbeddedFile object 27 at offset 0x22A6 85 bytes
embedded_file_obj0028.bin
7819f06630520bfd73f8079eece39a31ed650dc5a0392d84cc1a95b60eb179d9		 pdf-embedded-file PDF EmbeddedFile object 28 at offset 0x2358 1520 bytes
embedded_file_obj0029.bin
79b49d25fc659db3048626076e84bea1d1ff650fb695c73f85b5d04495a5c48c		 pdf-embedded-file PDF EmbeddedFile object 29 at offset 0x2625 15910 bytes
embedded_file_obj0030.bin
9bf2fa3b543c0c2a6957e7ce3c07b4993c3e48b553af0e7f644a591f58081dd3		 pdf-embedded-file PDF EmbeddedFile object 30 at offset 0x4C16 437 bytes
embedded_file_obj0031.bin
f23c9faf054dec10d2ad8550fdb68278f9d8f183a4f16925447bc13736640a65		 pdf-embedded-file PDF EmbeddedFile object 31 at offset 0x4CF1 9197 bytes
embedded_file_obj0032.bin
57045217c453d4674a08ad8778674bf199a7989a9505424a1815c016e6bb412f		 pdf-embedded-file PDF EmbeddedFile object 32 at offset 0x5416 212 bytes
javascript_obj0019_000.js
4a1aca004cf20431c9a66dce85404a6411a54d881a6c257882260ffc972a13eb		 pdf-javascript-stream PDF /JS object 19 at offset 0x1B2F 870 bytes
javascript_obj0021_001.js
4e139c8b22ec16bd5aa51575c80dec2bbf89b76977a06b68473031a0eb206366		 pdf-javascript-stream PDF /JS object 21 at offset 0x1CB3 2794 bytes
javascript_obj0023_002.js
c876171bd867b66b7671fb337ff9e57d18cd15b43d344cf5a7243821300a408a		 pdf-javascript-stream PDF /JS object 23 at offset 0x1FA2 1528 bytes

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