PDF malware analysis — malicious · f878f413403c9218

MALICIOUS

PDF

118.7 KB

MD5: f197c7c272bfd50a7bd46409413be3e4 SHA-1: bf69eab8df32abe67010594d3559028c61605cbb SHA-256: f878f413403c92184443ad3dfae1996a5d36809be6d05a3e158e0a1ef635a1f0

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF contains embedded JavaScript that utilizes `eval()` and `String.fromCharCode()` for obfuscation, a common technique for delivering malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be the execution of obfuscated JavaScript, likely to download and execute a second-stage payload, as suggested by the 'Large comment-padded JavaScript eval stager' heuristic.

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `24ef1abd33b90626a348890697172f54aad99a67ce716d39cbe578ec7069fe19`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627772 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).

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