PDF malware analysis — malicious · 68f85a6bc2e25a9c

MALICIOUS

PDF

13.9 KB Created: 2009-04-26 03:53:53 Authoring application: iwasgZpGkijpNssVm (via IUmAVyUgAXCSHFx)

MD5: 7a81322ef8f1cbfcff733ae8268f3440 SHA-1: d583d54a2c6b3111773303e59a1665a5c66d8390 SHA-256: 68f85a6bc2e25a9c1c8e35aadae88a36ad86c505dc7c14e445db017c5b768385

176 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF file that contains embedded JavaScript, flagged by multiple heuristics as an exploit. The JavaScript is obfuscated but appears to be designed to download and execute a secondary payload, as indicated by the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings. The specific exploit and payload are not fully discernible due to obfuscation, but the overall pattern suggests a downloader.

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_obj0009_000.js` `9c3395ed015eb848244f71d8ec720a5f03d78ba17a7f03a7aa1415be653ae55c`	pdf-javascript-stream	PDF /JS object 9 at offset 0x75E	11585 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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