PDF malware analysis — malicious · 10fa1d7a5bb176ec

MALICIOUS

PDF

2.4 KB

MD5: 4ea18e756aefdf573bf1689d6acf201d SHA-1: d14e69f83cb1c2fdfd727040e86284b3a5108a28 SHA-256: 10fa1d7a5bb176ecc01f70284c7bdfc2d67252522325f2009ea1805a074a02e4

156 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains obfuscated JavaScript, indicated by multiple PDF_JAVASCRIPT and PDF_JS heuristics, and a critical PDF_JS_EXPLOIT_CLUSTER finding. The JavaScript is designed to decode and execute a second-stage payload, as evidenced by the eval() call and String.fromCharCode usage. The ML classifier strongly flags this PDF as malicious. The primary function of the embedded script is to download and execute a secondary payload, likely initiated via a spearphishing attachment.

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` `2090200e7f4daa31714193c6e2843ec951daac9d53d6493aab6bb7506582f5b5`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x197	2553 bytes
`javascript_obj111712_001.js` `8e8f82d26c026ac3a37bb5bd9fd22dcae94346d3e64f50afab89b561bd3ea6bd`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x7AE	536 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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