PDF malware analysis — malicious · 84d10405b03d0994

MALICIOUS

PDF

5.1 KB

MD5: ee5473ac960b4e5aabfe376f9de09a7c SHA-1: d833474b8a3b0cf44b2958052f17f38c8f6b68d2 SHA-256: 84d10405b03d0994811949eb5fb2fd337308a682d3caea3341348e397cadfb0c

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/Shell Script Execution T1204.002 Malicious File

The PDF contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The presence of an eval() call within the JavaScript stream (PDF_EVAL) strongly indicates that the script is designed to execute arbitrary code. The ML classifier also confirms the malicious nature of the PDF. The embedded JavaScript file, javascript_obj9362_000.js, is the primary artifact responsible for the malicious behavior, likely downloading and executing a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

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_obj9362_000.js` `ff1a858b37e4855347ea20c80f4743942520046eb7a93e024ec6e14172c7d927`	pdf-javascript-stream	PDF /JS object 9362 at offset 0x134	8374 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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