PDF malware analysis — malicious · bdb9bc6eba1e865e

MALICIOUS

PDF

15.8 KB

MD5: e19ab2b54779bb0244e63ae32d080034 SHA-1: eb68793a851ad7d50ee024297ce8ade940ac3ae0 SHA-256: bdb9bc6eba1e865e527e7e0ca32a81d7cad374519da430deb3b5e69302df8e66

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment T1204 User Execution

This PDF file contains embedded JavaScript, including a large comment-padded eval stager. The heuristics indicate the use of eval() and String.fromCharCode, common techniques for obfuscating malicious JavaScript. ClamAV detected this as 'Pdf.Exploit.Agent-36086', strongly suggesting it's a known exploit. The primary function of the embedded script appears to be downloading and executing a secondary payload, as indicated by the 'ML_NYX_PDF_MALICIOUS' score and the 'Suspicious extracted artifact' heuristic. The lack of readable document body text means the specific lure cannot be determined, but the technical indicators point to a malicious exploit delivery.

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` `8d7e040a6f0d77ae70c93cb7df649464cd6193f2271b9f4c400dbf400a829e2c`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	426009 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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