PDF malware analysis — malicious · 604ae422a2f2c57b

MALICIOUS

PDF

174.9 KB Created: 2008-08-20 15:58:52 +08:00 Authoring application: Acrobat 编辑器 8.0 (via Adobe Acrobat 8.1.2)

MD5: 0e414fbd92b114c780e406d7bc142b4a SHA-1: 34f40f79017b56b5ae7dd63902bafa4330661c02 SHA-256: 604ae422a2f2c57b9d295597a8f477be1df6b8c09110202a84df003a5395a137

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF sample contains embedded JavaScript that utilizes eval() and String.fromCharCode() for obfuscation, a common technique for malicious scripts. The script is designed to download and execute a second-stage payload, as indicated by the critical PDF_JS_EXPLOIT_CLUSTER heuristic. While the specific family is not identifiable, the overall pattern suggests a downloader or dropper.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
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)
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.

Filename	Kind	Source	Size
`javascript_obj0032_000.js` `be2f686f0863cb218531ba0db25b1f7de002fd422804291b0325cec74d272cdf`	pdf-javascript-stream	PDF /JS object 32 at offset 0x7E0	3932 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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