PDF malware analysis — malicious · 61f9b17f11024270

MALICIOUS

PDF

8.4 KB Created: 2010-03-10 05:44:14 Authoring application: hVWdqvnkeHWAuymbPWWbFt (via bSUXfxhWmGxBvBG)

MD5: 374cf5625e2d4ea9f31fd1d304487c63 SHA-1: e4c03f456a34345122553f9a1208e1b3c54cbf50 SHA-256: 61f9b17f110242704f32c30817cba9bc2a3deeefff48f38c99d02fd76618f7c5

208 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript that utilizes an eval() call, a common technique for obfuscating malicious code. The JavaScript is designed to download and execute a second-stage payload, as indicated by the PDF_JS_EXPLOIT_CLUSTER and ML_NYX_PDF_MALICIOUS heuristics. ClamAV also detected this file as Pdf.Exploit.Agent-35572, confirming its malicious nature. The primary IOC is the embedded JavaScript file, which is the vector for the exploit.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

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-35572 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35572
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (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.
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `b7934e5b74ff54e072863f05f204045e781e7e22b0bad4d2908e4b3e7578c455`	pdf-javascript-stream	PDF /JS object 7 at offset 0x2E4	7073 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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