PDF malware analysis — malicious · 703bd1b762c4e87d

MALICIOUS

PDF

2.8 KB

MD5: 0b411f577d44d3ee3289f7a3edc30251 SHA-1: 0941bd7bcbe57cc0c66e277050d3d78353773c49 SHA-256: 703bd1b762c4e87d9cc4f2cd964181c74415cc5eea8a544a4d4cc9c6a920fc63

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 that utilizes eval() and String.fromCharCode() for obfuscation and execution. This script is designed to exploit a PDF vulnerability, likely leading to the download and execution of a secondary payload, as indicated by the 'Pdf.Dropper.Agent-1828784' ClamAV detection. The ML classifier and heuristic firings strongly support a malicious dropper functionality.

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-1828784 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-1828784
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` `6413ce03cd09e1c23c80f75b192aaeabe647a2a892526ccf6d04d3977b77884f`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	259 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `e143d1c189a7fc5bc5125ceb2b3cc202e4ddf3838992ec467f4038ba6f710008`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x269	3385 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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