PDF malware analysis — malicious · 868126c2cc232b18

MALICIOUS

PDF

3.3 KB

MD5: b10b8338b1c6389ec8faad34aa6b0d00 SHA-1: 605fb404387089be813b5d61cbb9950afd0bb8f8 SHA-256: 868126c2cc232b18a298c21dde1f10d561528ec219207e356c907f6b0050d73d

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 is obfuscated but appears to leverage the unescape() function, a common indicator of exploit code. The script likely attempts to download and execute a second-stage payload. The ClamAV detection and ML classifier strongly indicate malicious intent, pointing towards an exploit targeting PDF viewers.

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` `e9d321042fdcc494e7c1429a7314393a8421b5ec4280a2017334a83a6d73fc39`	pdf-javascript-stream	PDF /JS object 7 at offset 0xA8A	320 bytes

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