PDF malware analysis — malicious · 5af9cedcab0edd13

MALICIOUS

PDF

5.1 KB

MD5: ff646c95444046e300b359346640c700 SHA-1: f3a79ff3669ad00340b85ce0289e19d9121912cb SHA-256: 5af9cedcab0edd1355aa787543e58a9314cb5786e0d562f9dce6da28c538ae81

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript that is heavily obfuscated, but analysis indicates it uses eval() and String.fromCharCode() to construct and execute malicious code. This script is likely responsible for downloading and executing a second-stage payload. The ML classifier strongly indicates maliciousness, and the PDF JavaScript exploit cluster heuristic further supports this.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

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.
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_obj6952_000.js` `a11a696cb5d236c0f7d15123417d4c30c14a5b3c37c1500160fb583a7159b6df`	pdf-javascript-stream	PDF /JS object 6952 at offset 0x135	8368 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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