PDF malware analysis — malicious · 713708ec4489b7e9

MALICIOUS

PDF

3.2 KB

MD5: bb5e2ef7279f693927bfba726a28e98f SHA-1: 432e6e5ed245b9c019bccc23cf27a66846b072c5 SHA-256: 713708ec4489b7e9bd307bd4eaa8d634cd7970aa99a5ed514fdcabad6c74ff57

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 appears to be designed to download and execute a second-stage payload, as suggested by the PDF_JS_EXPLOIT_CLUSTER heuristic and ClamAV detection. The specific payload or download URL is not directly visible due to obfuscation, but the overall pattern indicates a malicious document intended for exploitation.

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` `4391c40cca04a5906eca4d8e84ca5d436d094fd1372e70347b386e17e4eeb75f`	pdf-javascript-stream	PDF /JS object 7 at offset 0x9C3	487 bytes

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