PDF malware analysis — malicious · 004f3d4d7b19fd3c

MALICIOUS

PDF

3.9 KB

MD5: 926e52fcaad2f8b9566c22ffc5b6b510 SHA-1: af11640abb7d9b52381e7d4284cde824b66e1ae1 SHA-256: 004f3d4d7b19fd3c938b9f03123c7bc3c8cb423a543ada1e8ba879729966b276

116 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.002 Spearphishing Attachment

The PDF file contains embedded JavaScript, identified by multiple heuristics including 'PDF_JAVASCRIPT' and 'PDF_JS_EXPLOIT_CLUSTER'. The ML classifier also strongly indicates maliciousness. The embedded JavaScript, named 'javascript_obj0039_000.js', is heavily obfuscated but its presence and the exploit cluster signal suggest it's designed to download and execute a secondary payload. The exact URL or payload is not directly discernible due to obfuscation and truncation.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

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.
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)
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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0039_000.js` `c71874737cb07933837a343e91b7f79c7514cafd0a91a0a90329907a675346d8`	pdf-javascript-stream	PDF /JS object 39 at offset 0xA	16410 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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