PDF malware analysis — malicious · e567ba09f417d6db

MALICIOUS

PDF

118.8 KB

MD5: f02b429364bf8d1a7b3597b268da873b SHA-1: 3695144613ea1bc025fe4c4e0b25bd706a42b3ce SHA-256: e567ba09f417d6db3dabe0bed71249754d827f50a1e82828cc292694c1877ae3

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains embedded JavaScript with multiple high-severity heuristic firings, including `eval()` calls and a large comment-padded eval stager. ML classification and ClamAV detection strongly indicate malicious intent. The embedded JavaScript stream, named 'javascript_obj0006_000.js', is the primary artifact, and its obfuscated nature suggests it's designed to download and execute a second-stage payload. The presence of `eval()` and `String.fromCharCode` within the JavaScript points to dynamic code execution and obfuscation techniques.

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` `df7249a98f8c6bf7bbb95fd2de01629249ea80e189b3ce2be389abb9729877f4`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627400 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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