Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3aa4ce89391afad…

MALICIOUS

PDF

30.9 KB Created: 2013-01-23 15:35:50 +03:00 Authoring application: Adobe Designer 7.0
MD5: b255768ebf010515cdaf80405c112090 SHA-1: b74ede1f674fa8eb98568b5192d42705c6a687ea SHA-256: d3aa4ce89391afad954773da47e521556ca785fa64cec74a79e809903040e514
132 Risk Score

Malware Insights

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

The PDF file contains multiple embedded JavaScript streams, flagged by high-severity heuristics as risky executable scripts within an XFA form. The ML classifier also strongly indicates maliciousness. The embedded JavaScript is likely responsible for downloading and executing a secondary payload, a common technique for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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.
  • 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
  • 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#
    • 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_obj0028.bin
c06dcd026a7ea0536b63e07ce688691b585339a3ab7ff59065e546b56308c7bb		 pdf-embedded-file PDF EmbeddedFile object 28 at offset 0x257F 85 bytes
embedded_file_obj0029.bin
e0092de902c56590f704951aaaca149b1d7b8f021514c930acc8c4849b18f0b0		 pdf-embedded-file PDF EmbeddedFile object 29 at offset 0x2631 1182 bytes
embedded_file_obj0030.bin
9acbf3604f01c3f908c5464ee6ccb4af9df6a219406bdc78e82c0f28e1a5daa7		 pdf-embedded-file PDF EmbeddedFile object 30 at offset 0x2881 9131 bytes
embedded_file_obj0031.bin
0b7fe2cbe79087012463f41fc1327af7a43b4981b1049b2448bcaa170e431454		 pdf-embedded-file PDF EmbeddedFile object 31 at offset 0x3822 171 bytes
embedded_file_obj0032.bin
ce4a3f07835c725838e55947d6b1f21771e0ad8084ee86d0890ecc12bd5231fd		 pdf-embedded-file PDF EmbeddedFile object 32 at offset 0x38EA 2427 bytes
javascript_obj0020_000.js
4a1aca004cf20431c9a66dce85404a6411a54d881a6c257882260ffc972a13eb		 pdf-javascript-stream PDF /JS object 20 at offset 0x1E08 870 bytes
javascript_obj0022_001.js
4e139c8b22ec16bd5aa51575c80dec2bbf89b76977a06b68473031a0eb206366		 pdf-javascript-stream PDF /JS object 22 at offset 0x1F8C 2794 bytes
javascript_obj0024_002.js
c876171bd867b66b7671fb337ff9e57d18cd15b43d344cf5a7243821300a408a		 pdf-javascript-stream PDF /JS object 24 at offset 0x227B 1528 bytes
font_00_cff_off00003cba.bin
0ae41b450cb5b4dbaad95b749403e081d0248df2726b0ca72bad3f2c04ed0fe1		 pdf-font-stream PDF embedded font (cff) at offset 0x3CBA 6681 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.41, consistent with packed or encrypted content.

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