PDF malware analysis — malicious · 01abc4efec51fe9e

MALICIOUS

PDF

3.2 KB

MD5: 34b08fd1a5a35b67519aeaf55674d07a SHA-1: c5ffeb5c212fed4183cce57c06b2e30bce8a8a75 SHA-256: 01abc4efec51fe9e52434d3b7c391faf9e09cd56071bb5ae104b8d711eff9c5a

206 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded JavaScript that utilizes an unescape function, a common technique for obfuscating malicious code. The JavaScript attempts to call a function that likely executes a downloaded payload, as indicated by the 'PDF JavaScript exploit cluster' heuristic. ClamAV also detected this as Pdf.Exploit.Agent-36121, confirming its malicious nature.

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` `c013a8bac1ced12dc5c4c574bafe23889fe6879f7e8ac36581e6dfd82688d9a2`	pdf-javascript-stream	PDF /JS object 7 at offset 0x9C3	459 bytes

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