PDF malware analysis — malicious · 7ac2f854d8d6b2da

MALICIOUS

PDF

9.4 KB Created: 2009-09-16 03:55:34 Authoring application: mjqXWOrREouMbnk (via ysOqMVSVeSuyogjZXSWf)

MD5: 4ffb0390f2ce119bc5f4e721a7dff888 SHA-1: 06e48d66b8510cc889cd7d6880c3c687658b89d0 SHA-256: 7ac2f854d8d6b2dab815ae1ccc4afd1309b5f5175654b6ba4126ecf06533f87d

208 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 using eval(). This script is designed to download and execute a second-stage payload from a hardcoded URL. The critical PDF_JS_EXPLOIT_CLUSTER and ML_NYX_PDF_MALICIOUS heuristics, along with ClamAV detection, confirm the malicious nature of the file. The script's primary function is to act as a downloader for further malicious activity.

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` `edef2cb83108e8176b566866fa18d437b03d73985723e80776e0075bdcdd6b0d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x445	7784 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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