PDF malware analysis — malicious · 09e345858b89fa56

MALICIOUS

PDF

2.8 KB

MD5: 0bd23816d2f7e871f3ec9635841926a9 SHA-1: cb9b89b6de90a4c9d3af9458aa11b66deee273cc SHA-256: 09e345858b89fa56e164221bf390aab4817fad1a4f9296fb8b535234aab305ce

216 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains embedded JavaScript, including calls to eval() and String.fromCharCode(), which are indicative of obfuscated malicious code. The JavaScript streams are designed to download and execute a second-stage payload, as suggested by the PDF_JS_EXPLOIT_CLUSTER heuristic and ClamAV detection. The primary function appears to be acting as a dropper for further malicious activity.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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-7226616-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7226616-0
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. (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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111611_000.js` `26d8659d6505505a05f03868bad870c675736c9ccc71e10e21abea9786e9f030`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	257 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `060a73eee726541578b86633ab81ad7356d19bc22916da98f1c333d6e4b90379`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x267	3342 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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