PDF malware analysis — malicious · 9cf42b6d17ded782

MALICIOUS

PDF

4.0 KB

MD5: a953f86db4ba174b774b61587b7f3582 SHA-1: 89ed82d448f6d1ebe663955ae3c3edba93ac69f1 SHA-256: 9cf42b6d17ded782a042bd6a24d4afff619fcd925ae6492c127e422975ac52a9

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, including calls to eval() and String.fromCharCode, which are indicative of obfuscation. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary function appears to be downloading and executing a second-stage payload, as suggested by the 'Dropper' classification and the presence of obfuscated JavaScript streams.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Dropper.Agent-7286688-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7286688-0
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_obj0013_001.js` `162b06f7bb2c459b4e77db70f4bce00fb33595f53767caf90f90aae9b7b36ff2`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6345 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `98a5c589daec4995c9bcb00edf3c64b8c4855cfc29abf43e85d38986d484d63c`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3606 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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