PDF malware analysis — malicious · 301dcb088bb4e628

MALICIOUS

PDF

118.6 KB

MD5: e1838cda9f3d618448dda3834d6d1693 SHA-1: 4f1674b626e8a798a5ce0d6d8dbc61cbd5553222 SHA-256: 301dcb088bb4e628dc9aea374c977cd71e0ff761cf8209182ffb1fe251a9e995

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, including a large, comment-padded eval stager. High-confidence ML classification and ClamAV detection as 'Pdf.Exploit.Agent-36086' strongly indicate malicious intent. The JavaScript likely downloads and executes a second-stage payload, leveraging techniques such as eval() and String.fromCharCode().

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` `f89f9bb7e00b39f7582c1eda922c9024560d8298dfb1e865ee4283ff38c7db80`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626341 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_off0001d8b2.bin` `21a487d2ddd23c4311ca3593c7169f78e3dc4091be8f5fcaf3a83f1d90b9bb4e`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D8B2	200 bytes

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