Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ae7f5085ba1122b…

MALICIOUS

PDF

87.9 KB Created: 2010-05-04 08:37:44 +08:00 Authoring application: Acrobat Web Capture 7.0
MD5: bda25ad483885693d93f13d9d9377808 SHA-1: afdf7b2c7ba1264de3e4e78416332232f85716a7 SHA-256: 9ae7f5085ba1122bd12e5ff1c0afc10d19730234b689a1124e1f43a85ad3fc95
84 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript, which is obfuscated and uses eval() and String.fromCharCode(). This indicates an attempt to hide malicious code execution. The heuristic 'EXTRACTED_FILE_STATIC_TRIAGE' flagged the embedded JavaScript file 'javascript_obj0037_000.js' due to obfuscation and long encoded blobs. The likely intent is to download and execute a second-stage payload.

Heuristics 6

  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  • Suspicious extracted artifact medium 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.
  • 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.
  • String.fromCharCode low PDF_FROMCHARCODE
    String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
  • 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://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0037_000.js
e93f32651195259b64d1a1cedc9097e7cb099d84a8994f3b6627e13d7782b193		 pdf-javascript-stream PDF /JS object 37 at offset 0xA35 16095 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 14 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s). Carved artifact contains 6 long hex-escaped blob(s).

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