PDF malware analysis — malicious · 7bb3b8e34ee981b9

MALICIOUS

PDF

3.3 KB

MD5: 178185e050cd15361d2487eb222dbf1f SHA-1: 5854183c2c609125cb883be4d020a1823ac6e819 SHA-256: 7bb3b8e34ee981b9f5f64393da4a5da125d19f0d670fd9c4805501a66d27a1b7

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 decode and execute a string derived from the PDF's title property. This behavior, combined with critical heuristic firings for PDF JavaScript exploits and ClamAV detection, strongly suggests the file is designed to exploit a vulnerability and download a secondary payload. The specific exploit and payload are not directly discernible from the provided evidence, leading to an unknown family classification.

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` `2a0a862609ebfa6a31ace15d355b9c61eb561afcf6e3df8e73b0463a79b31d36`	pdf-javascript-stream	PDF /JS object 7 at offset 0xA7A	320 bytes

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