Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a30aac33a207dd9…

MALICIOUS

PDF

6.9 KB Created: 2012-01-04 14:11:31 -05:00 Authoring application: Acrobat Editor 8.0 (via Adobe Acrobat 8.3.1)
MD5: a8ac1f00c7ce1165ef143c6fa20e66e0 SHA-1: 094f109b94307cd8f94ab84b96d57cab7d304362 SHA-256: 5a30aac33a207dd9e42bf2e161694ed3093e2d9873f1ae4a43c507116374cde4
250 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1027 Obfuscated Files or Information

The PDF file contains obfuscated JavaScript that utilizes eval() and unescape() functions. The script attempts to display a fake alert message to the user, indicating a potential lure or proof-of-concept for malicious activity. While no direct payload execution or network communication was observed, the heavy obfuscation and use of exploit-related functions suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9679

Heuristics 8

  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
  • ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • 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.
  • 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://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_obj0028_000.js
05075621c190682b61f914fba31f8101fe124478db45ed4917fe5e1471c98ed3		 pdf-javascript-stream PDF /JS object 28 at offset 0x789 310 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s).

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