Malicious PDF — malware analysis report

Static analysis result for SHA-256 217356bacd9122ad…

MALICIOUS

PDF

45.8 KB Created: 2006-10-03 13:54:05 -05:00 Authoring application: OmniForm Premium (via APJavaScript 2.2.1 Windows SPDF_1112 Oct 3 2005)
MD5: 203b6419140d9d6321d187e9babc7bbc SHA-1: 2a541f58bec6a623303a786169710e9eea74b168 SHA-256: 217356bacd9122ad5dafef2e73b9b5f319228bcc72495d2e34988cebaa542d96
82 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly suggests maliciousness. The embedded JavaScript stream, stream_006_off0000ad3f.js, is the primary indicator of malicious activity. While the exact script functionality is not fully detailed, its presence within a PDF, combined with the ML score, points to a likely exploit or downloader. The document body is heavily obfuscated and does not provide clear user-facing content, making the script the main focus for understanding the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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/iX/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/pdfx/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000ad3f.js
d1dfd457a2fdd3cec4091f689f39b85b35666aa5599ef3a8d5f9a80d1e2ce105		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xAD3F 1042 bytes
font_00_type1_off0000b1ed.bin
c6bf78478c9c4dd5b3b86554d34c78f847f70af4118f9ff083c1fccf0e8e932b		 pdf-font-stream PDF embedded font (type1) at offset 0xB1ED 97 bytes
font_01_type1_off0000b47c.bin
b749644b3e758e7335900ab2e7499eaa64b3a946849f1f8a0948287bdd96763d		 pdf-font-stream PDF embedded font (type1) at offset 0xB47C 144 bytes

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