PDF malware analysis — malicious · 175326bc94f0f221

MALICIOUS

PDF

3.2 KB

MD5: c9c0e070a224c27aa3e2fbf7b00dc5d6 SHA-1: 95343c7ae5282f3c165f210d837fe0aa4c8af80b SHA-256: 175326bc94f0f2216682392eee2a26533a2dc64d371aeb4c24d9d0cfc81a70e4

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 code. The script attempts to call a function with a string derived from the PDF's title, which is likely intended to trigger the exploit. This behavior, combined with critical heuristic firings related to JavaScript exploits and ClamAV detection, strongly suggests the file is malicious and aims to download and execute a secondary payload.

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` `6972ec540f94c8e6e201fe9684e319546ac271c61565f440bd6a27b3032ea1eb`	pdf-javascript-stream	PDF /JS object 7 at offset 0x9C4	423 bytes

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