PDF malware analysis — malicious · 84b90c20b7b14d04

MALICIOUS

PDF

3.2 KB

MD5: 072cb16f80f4a35df4830fe881dbc3cc SHA-1: 81b35a2e4153f09b01653c5b6cee4e909d4441c1 SHA-256: 84b90c20b7b14d049ad2561d79fb89e8b9c547f44043ef945bd88be0b02c06c1

206 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 utilizes the unescape function, a common indicator of exploit activity. The script appears to be designed to download and execute a secondary payload, as suggested by the heuristic firings related to PDF JavaScript exploits. The ClamAV detection of 'Pdf.Exploit.Agent-36121' further supports the malicious nature of the file.

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` `83450410a849a7d0961626ea1243ca0cc7d8720e1666d3722a8910781ee8528f`	pdf-javascript-stream	PDF /JS object 7 at offset 0x9C7	505 bytes

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