Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6d790936d40e5f2…

MALICIOUS

PDF

2.38 MB Created: 2012-05-29 19:00:30 +02:00 Authoring application: PScript5.dll Version 5.2.2 (via Acrobat Distiller 9.0.0 (Windows))
MD5: eef65430e5b65c50d1ab53c7fb8b9d11 SHA-1: 090c205a3d3120c1df153994c3d12916fc949017 SHA-256: c6d790936d40e5f2e84d10a2ae557cb294e5b3536665b4de12f12ba3e505db69
116 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript T1566.002 Spearphishing Attachment

The PDF contains embedded JavaScript, including a call to eval(), which is a strong indicator of malicious intent. The ML classifier also flagged this PDF as malicious. The presence of obfuscated JavaScript suggests the file is designed to download and execute a secondary payload. The high stream count may indicate further obfuscation techniques were employed.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7219

Heuristics 7

  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  • Unusually high stream count medium PDF_MANY_STREAMS
    PDF contains 501+ stream objects — may indicate heap spray or heavy obfuscation
  • 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.
  • Additional-actions dictionary low PDF_AA
    PDF defines /AA (Additional Actions) that references an executable action (JS/JavaScript/Launch/SubmitForm) — can auto-trigger on document or widget events. Form-field calc/format/validate/keystroke handlers in legitimate interactive forms commonly fire this, so it is reported as a low-weight signal; weaponised auto-execution is flagged by stronger rules (PDF_OPENACTION, encrypted-with-JS, etc.)
  • 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/pdf/1.3/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0001_004.js
2bc572edfe05606a9e922d3a7527ca9e2731d972de5841dee2c196393636c3d0		 pdf-javascript-stream PDF /JS object 1 at offset 0xF 1558 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 8 eval/decoder/string-building token(s).
icc_00_off00234064.icc
2b3aa1645779a9e634744faf9b01e9102b0c9b88fd6deced7934df86b949af7e		 pdf-icc-profile PDF ICC profile at offset 0x234064 3144 bytes

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