PDF malware analysis — malicious · 80592c82acabb6f5

MALICIOUS

PDF

2.6 KB

MD5: 21195536f00dbb987abb8d28dbc56528 SHA-1: 11fb1d3b9c6bd62e4aaac3ecc524ef51cf7e36ec SHA-256: 80592c82acabb6f5c890510620479ab7f0d178377bd7be85fe0ef8c0be731f04

216 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file contains obfuscated JavaScript that utilizes eval() and String.fromCharCode() to execute malicious code. The embedded JavaScript is designed to download and execute a second-stage payload, as indicated by the 'Pdf.Dropper.Agent-5343183-0' ClamAV detection and the ML classifier's high confidence score. The primary attack pattern involves exploiting the PDF viewer to run arbitrary code, likely delivered via spearphishing.

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-5343183-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-5343183-0
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` `3c64a4ceeb46d0b831cec627432ff65ec5ed4854f2a4103ead080a0d29c497fc`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	258 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `4615b8a30ea348c16c1b3c6a0f08fc99193a91381214fb4dfaa6896c959f4843`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x268	3294 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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