PDF malware analysis — malicious · 00afc9ae620659a1

MALICIOUS

PDF

2.6 KB

MD5: f05e4d010ed9abf474b2e6958568ee14 SHA-1: 00082658d51be64175661df6c08e782bdc72d1af SHA-256: 00afc9ae620659a1544ec7dbf197bdbad6230875b130c3734cef8973b39e7584

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS_EXPLOIT_CLUSTER. The JavaScript utilizes eval() and String.fromCharCode, indicating obfuscation and potential exploit code. The primary script, javascript_obj111711_000.js, appears to be heavily obfuscated but its structure suggests it decodes and executes further content, likely a second-stage payload. The ML classifier strongly indicates maliciousness.

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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `3e411a57cba0b3b88b0cbda8fef32257d16b4322e731521fd50de43421714933`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x197	2497 bytes
`javascript_obj111712_001.js` `a893581b6daa0454775165f58ea3a1437997da75158b4a9cfc4a808094d3605b`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x878	624 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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