PDF malware analysis — malicious · df32eb8f5caea3ac

MALICIOUS

PDF

15.7 KB

MD5: e3905c44261a2d70a386b64b526a424c SHA-1: ff653549acc7708276fe77f10f27927cc136e2aa SHA-256: df32eb8f5caea3ac24f82d50fe04c0d046af9ff6d9aa0a66b98a27941d49dbe9

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file was flagged as malicious by ClamAV with the signature Pdf.Exploit.Agent-36086. Static analysis revealed multiple high-severity heuristics related to JavaScript execution, including eval() calls and a large comment-padded JavaScript eval stager. The embedded JavaScript stream, javascript_obj0006_000.js, is highly obfuscated but its presence and the associated heuristics strongly suggest it is designed to download and execute a second-stage payload. The ML classifier also returned a near-perfect score for 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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `b39e8ff499e5bdc557a0e6379c98818bf288407611dd5a67b7f04a84ae5a834b`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	424933 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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