PDF malware analysis — malicious · 037c3904a8349223

MALICIOUS

PDF

2.7 KB

MD5: ed8ac8b8ec1f23ab2964bd4f7f9475e0 SHA-1: 6e782658f916a9dcd6a9d4e377f76a34918711b8 SHA-256: 037c3904a83492234e469fae33cf146f71f4a8099fd0f6c9333b9e6e86c3d4b5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF sample contains embedded JavaScript streams that are obfuscated and utilize eval() and String.fromCharCode() for execution. Heuristics indicate a PDF JavaScript exploit cluster, suggesting the primary function is to download and execute a secondary payload. The ML classifier strongly flags this PDF as malicious. No specific family could be identified due to the generic nature of the exploit and obfuscation.

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_obj111611_000.js` `59c15039148cf4b02336e04b9b0f4c598bcfebd2d1ce804b1b7ccb2493edbe63`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	257 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `9cbe58729f9720e2affa205275bd28341e83cd1c51cfe755df17195d01a56832`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x267	3283 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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