PDF malware analysis — malicious · 8ce5af91b5884dde

MALICIOUS

PDF

2.6 KB

MD5: c370a955d132e8e9fb63f3800b4f1e1e SHA-1: d42c95670ce3bbb21b2619eb544987d55a0420b4 SHA-256: 8ce5af91b5884dde4d3bd2fb343be359a546044fc44c27087ea8bcfcde17b76d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, including calls to eval() and String.fromCharCode(), which are indicative of obfuscation and dynamic code execution. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary function appears to be downloading and executing a second-stage payload, as indicated by the 'Pdf.Dropper.Agent-7281104-0' ClamAV signature. No specific family could be identified, but the dropper functionality is clear.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Dropper.Agent-7281104-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7281104-0
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` `65b5da784cc6162996521c1c53ea3705770951019c1bad43856821af67ba489d`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x197	372 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111712_001.js` `dfc393e3fa87d13cc2a4a95db4a3f7d0239e254242129fd34bd1d48ad44d9f3f`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x248	2934 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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