PDF malware analysis — malicious · fe205795096c9907

MALICIOUS

PDF

15.7 KB

MD5: ef5c4920da78c7efcaa069fe714b3091 SHA-1: 01625ea43a5325ab90563499d7bd3f29bb6b791b SHA-256: fe205795096c990744ef17c8089710e94c8f276d6423c7a3bbd5664e11152a50

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript with multiple high-severity heuristic firings, including PDF_EVAL and PDF_JS_LARGE_COMMENT_PADDED_EVAL. ClamAV also detected it as Pdf.Exploit.Agent-36086. The embedded JavaScript is obfuscated but appears to be a stager designed to download and execute a secondary payload. The ML classifier strongly indicates maliciousness.

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` `b890db693d06e79c8f6bf74def8bda0f18ce7acbc6711995a6417b972d471dcd`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425228 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_001_off00003b73.bin` `56f87f27e1eb1c8248eccb82ba22751403811226a42185ef8920ccee19906307`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3B73	300 bytes

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