PDF malware analysis — malicious · 09dd66b5023b989c

MALICIOUS

PDF

36.3 KB Created: 2009-08-26 10:12:59 Authoring application: XUTtnshpdQRHW (via AnphpAGdwayaRHGThXdzODTtm)

MD5: c764d2b65ecfef99609ac89dcb0fb251 SHA-1: d5be9440cd1f32d4addf134f8fce215891211bb7 SHA-256: 09dd66b5023b989c0b80ccc1246f0f75e0fe8511b1203ca26fcc2b67a75cbb84

216 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is a PDF file that contains embedded JavaScript, flagged by multiple heuristics as a potential exploit. The JavaScript stream, identified as 'javascript_obj0023_000.js', is heavily obfuscated but contains calls to 'eval()' and 'fromCharCode()', indicating it is designed to execute malicious code. This pattern is consistent with a dropper that downloads and executes a secondary payload, likely exploiting a client execution vulnerability. The ClamAV detection 'Pdf.Dropper.Agent-7226614-0' further supports this assessment.

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-7226614-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7226614-0
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_obj0023_000.js` `fecf8f838ffe27501465b07f16c18933d6da3b9c8f51fdef3e60d46ed5ce5598`	pdf-javascript-stream	PDF /JS object 23 at offset 0x4CDC	16350 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 12 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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