PDF malware analysis — malicious · 56af3d399baab033

MALICIOUS

PDF

76.2 KB Created: 2010-01-24 22:04:50 Authoring application: QVOWv9qq9 (via FBYbPMU92)

MD5: 53dce6a1a66c868728bcb230f7d4095f SHA-1: 2b6c97feb9da1c043267f9cbf0e0d137b45ea66e SHA-256: 56af3d399baab033952ef481d5cadecf64b17d692fef379eef8b99513c6a4de3

216 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 `eval()` and `fromCharCode()` functions, indicating an attempt to obfuscate malicious code. The ClamAV detection 'Pdf.Dropper.Agent-7213111-0' and the ML classifier strongly suggest this is a dropper. The JavaScript is likely responsible for downloading and executing a secondary payload, which is a common technique for this type of malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 7

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.Dropper.Agent-7213111-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7213111-0
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.
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` `7af451babd3e55e22b79f44ab0d68d1f5fddd4458bbb6623a3882e1f53e624e2`	pdf-javascript-stream	PDF /JS object 7 at offset 0x23C	76844 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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