Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a47ba9cd3563a34…

MALICIOUS

PDF

19.3 KB Created: 2013-04-23 11:01:12 +04:00 Authoring application: Adobe Designer 7.0
MD5: e3247a0357143509b179b3a2b8894a2a SHA-1: 550ba90cd7e60ba8dbed9c350d4bf48e0b4aa825 SHA-256: 9a47ba9cd3563a341e0bab07148f3bbbff88fd98a5d57cdde96db514fbc06e0d
192 Risk Score

Malware Insights

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

The PDF file contains XFA form elements with embedded JavaScript, specifically triggering a heap spray exploit. This JavaScript is designed to download and execute a second-stage payload. The ML classifier strongly indicates maliciousness, and the presence of XFA heap spray code points to a common exploit delivery technique. No specific family could be identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 9

  • 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.
  • XFA JavaScript heap-spray exploit code critical PDF_XFA_HEAP_SPRAY
    PDF contains XFA script content with heap-spray or shellcode-like JavaScript markers such as large encoded word sequences, util.pack, large arrays, or spray variable names. This is a weaponised Adobe Reader exploit pattern, not a normal interactive form.
  • 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 0x21E4 85 bytes
embedded_file_obj0028.bin
7819f06630520bfd73f8079eece39a31ed650dc5a0392d84cc1a95b60eb179d9		 pdf-embedded-file PDF EmbeddedFile object 28 at offset 0x2296 1520 bytes
embedded_file_obj0029.bin
30a4fa32ff9ad542bb87c66c9ca9862f23277393539949c12552612d753cda74		 pdf-embedded-file PDF EmbeddedFile object 29 at offset 0x2563 8237 bytes
embedded_file_obj0030.bin
a06685a8dddcc802539b646cc851f6ede787e7046effd616caf88be190c18d40		 pdf-embedded-file PDF EmbeddedFile object 30 at offset 0x366D 455 bytes
embedded_file_obj0031.bin
e705f8fbc86048d63338b8eee28deb3965d674af1b338994f05e4470e86f53c9		 pdf-embedded-file PDF EmbeddedFile object 31 at offset 0x3752 4643 bytes
embedded_file_obj0032.bin
57045217c453d4674a08ad8778674bf199a7989a9505424a1815c016e6bb412f		 pdf-embedded-file PDF EmbeddedFile object 32 at offset 0x3BAB 212 bytes
javascript_obj0019_000.js
4a1aca004cf20431c9a66dce85404a6411a54d881a6c257882260ffc972a13eb		 pdf-javascript-stream PDF /JS object 19 at offset 0x1A6D 870 bytes
javascript_obj0021_001.js
4e139c8b22ec16bd5aa51575c80dec2bbf89b76977a06b68473031a0eb206366		 pdf-javascript-stream PDF /JS object 21 at offset 0x1BF1 2794 bytes
javascript_obj0023_002.js
c876171bd867b66b7671fb337ff9e57d18cd15b43d344cf5a7243821300a408a		 pdf-javascript-stream PDF /JS object 23 at offset 0x1EE0 1528 bytes

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