PDF malware analysis — malicious · 0196c01d1dd58cfa

MALICIOUS

PDF

3.2 KB

MD5: 9c4dfc992f040d5ea07b490fd5e5af48 SHA-1: 4142cacef29bf49b000ac0cb21dad8b0df5b9be9 SHA-256: 0196c01d1dd58cfa7189678331bf6322b7a11c30e5fe5301850ad6c39ca4e8ed

206 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript that is obfuscated but appears to leverage the `unescape()` function, a common technique in PDF exploits. The script attempts to call a function that is likely responsible for downloading and executing a second-stage payload. The ClamAV detection and ML classifier strongly indicate malicious intent, pointing towards a PDF exploit dropper.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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.
ClamAV: Pdf.Exploit.Agent-36121 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36121
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `d292b2be188561a505c34b04324b4b41d13a74282c0e73e3e6c0bfefae562cbe`	pdf-javascript-stream	PDF /JS object 7 at offset 0x9C6	459 bytes

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