PDF malware analysis — malicious · 601fc4a03a12c078

MALICIOUS

PDF

3.2 KB

MD5: 55c9b71d43e11384e608c3c81d71e9a5 SHA-1: 8bc2d36f877119dc43cd857e643f666b176bdc21 SHA-256: 601fc4a03a12c078d13b2ce536dc475efe8d584994ce511ed200dc729d575485

206 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file contains embedded JavaScript that utilizes the unescape function, a common indicator of exploit code. The JavaScript is likely designed to download and execute a secondary payload, as suggested by the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics. The reconstructed string 'eval' from the script indicates dynamic code execution.

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` `f1c13b5c6cf84effd59f7a190b83b8b8f378d168782e758d0c7896bb3dd48bf3`	pdf-javascript-stream	PDF /JS object 7 at offset 0x9C8	450 bytes

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