PDF malware analysis — malicious · b794968ab13cbb49

MALICIOUS

PDF

15.7 KB

MD5: d750a4e9dad06ad118babf2959b2c601 SHA-1: f74b9271ef1907c543a0de29b1ab31f97df82c25 SHA-256: b794968ab13cbb499a2b80f8f188f9ad7765e9e0c1b26027ffb32b9012592081

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_EVAL'. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics strongly suggest malicious intent, with ClamAV identifying it as 'Pdf.Exploit.Agent-36086'. The presence of 'eval()' and 'String.fromCharCode' within the JavaScript stream points to obfuscation and dynamic code execution, typical for downloading and executing further stages. The ML classifier's high confidence score further supports this assessment.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

ClamAV: Pdf.Exploit.Agent-36086 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36086
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
Large comment-padded JavaScript eval stager high PDF_JS_LARGE_COMMENT_PADDED_EVAL

PDF JavaScript contains a very large stream padded with long random-looking block comments around String.fromCharCode and eval. This is an exploit-kit obfuscation shape used to bury a decoder and recovered stage inside noise, not normal PDF form automation.
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_obj0006_000.js` `8dcfe29485069a8a064274b37247ca6b82ec0e1c56a53b24705b2a9eb263cc51`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	424974 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 42 long base64-like blob(s).
`stream_002_off00003d22.bin` `23a85c8a37337dd174623f7bccaf6c681e5130f8f24bf2c0b2cb74352d7fa82f`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3D22	200 bytes

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