PDF malware analysis — malicious · 05a1e8e74928f164

MALICIOUS

PDF

16.0 KB Created: 2009-09-30 19:42:99 Authoring application: PDF Library 7.5.6 (via PDF Library 6.5.1)

MD5: c4f6de1addbf74414f44cd2122aaee75 SHA-1: d9cb98f6582851fa6e951b26fd786fe93742422f SHA-256: 05a1e8e74928f164c699d091bbf1b4fd25fcfd3a4c3702bcfa36e5f28e38dbd3

236 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded JavaScript that utilizes eval() and String.fromCharCode(), common indicators of obfuscated malicious code. Heuristics and ML classification strongly suggest malicious intent, with ClamAV identifying it as Pdf.Malware.Agent-7433260-0. The JavaScript is heavily obfuscated and truncated, but its structure indicates it is designed to execute arbitrary code, likely downloading a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 8

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.Malware.Agent-7433260-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Malware.Agent-7433260-0
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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. (matched inside decoded stream)
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` `1bd63e8fbbbf40cf02e7d62e1fb2243d380ea48c69aacfb36c73931d232dfa0d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x268	173194 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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