PDF malware analysis — malicious · 5e12c5b02853daed

MALICIOUS

PDF

9.0 KB Created: 2010-06-22 01:23:50 Authoring application: BnRjDFsoJUyTDiS (via dNbcfAvUyTZyhuv)

MD5: 05e7e905a318c5dfba9fa34142471efb SHA-1: 9ec2f19c10cc03e08c2d23523f03a8e593e34c00 SHA-256: 5e12c5b02853daedbca81a45a56d3a5500abde44745b7535f0d7f7505bf1e384

176 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains embedded JavaScript, identified by multiple heuristics and flagged by ML classifiers and ClamAV as malicious. The JavaScript is obfuscated but appears to be designed to download and execute a second-stage payload, as indicated by the 'eval' function and the large size of the script. The exploit cluster firing suggests it leverages a known PDF vulnerability for execution.

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
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape 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` `b863520ee78b0c1467d784b55d22e5d487de0301e8d391308fa7f2684fec9f8f`	pdf-javascript-stream	PDF /JS object 7 at offset 0x3D1	7455 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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