PDF malware analysis — malicious · 0d3fb5aae14bc097

MALICIOUS

PDF

12.9 KB

MD5: 9c842291bf4087892837a89f76b7aa9f SHA-1: c4d9a7cddd59df89d568584d4d624a36ae70e541 SHA-256: 0d3fb5aae14bc0971ee5673f5506421ddf64882ce760b1c32f871a8a284b33c7

116 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript that is obfuscated using character codes. The script decodes to construct strings related to document objects and potentially malicious actions. The primary function appears to be downloading and executing a second-stage payload, indicated by the use of 'app.doc', 'app.eval', and string manipulation functions like 'unescape' and 'escape'. This behavior is characteristic of a downloader malware.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

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.
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_obj0005_000.js` `c09cce6ca3001aa4fc687e7595243eb0dc3da819ff999ce64900fd01e97532b8`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	1162 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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