PDF malware analysis — malicious · 88bba598c55a458b

MALICIOUS

PDF

4.3 KB

MD5: dbcdb40c657782d05499ae73f972f677 SHA-1: eda842c58a541d57ec9d93b1748cdc8053db0a27 SHA-256: 88bba598c55a458b5826c85a36ed537fb3c1dd5c23f8145ef8f7138a2e91713f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF contains embedded JavaScript that utilizes eval() and String.fromCharCode, indicating obfuscated code execution. The JavaScript is designed to download and execute a second-stage payload, as evidenced by the PDF JavaScript exploit cluster heuristic. The ML classifier strongly flags this PDF as malicious.

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_obj6548_000.js` `3d5333e31567f805d94f47621086e02fdc2c81133ae1b6c4fc0059c3ac4451a3`	pdf-javascript-stream	PDF /JS object 6548 at offset 0x134	8300 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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