PDF malware analysis — malicious · 11c9debc86c1dd7b

MALICIOUS

PDF

6.3 KB Created: 2009-05-25 18:34:49 Authoring application: zSNbWrqpCDLrT (via hGxbVYFZPwwUzykcu)

MD5: 41b1a113f5b0062048dc72aa22271491 SHA-1: e5dabeb1cf6979e2fdbbc17087644d1914745f29 SHA-256: 11c9debc86c1dd7bc4e0e89e9753297158a259ee7341209d49ffe17a262eb84d

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 from a URL, as indicated by the 'ML_NYX_PDF_MALICIOUS' and 'PDF_JS_EXPLOIT_CLUSTER' heuristics. ClamAV also detected this as 'Pdf.Exploit.Agent-35572', confirming its malicious nature.

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` `63f1b036348dcc43a56a7dbaa06afb68b0c0f051d09162816dff4fad9db94e1d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x430	4640 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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