PDF malware analysis — malicious · 39fb306c6f7ecced

MALICIOUS

PDF

15.7 KB

MD5: 47229b9166b8ad97176d8834900bc5ab SHA-1: 4ed34d548fd18cc2ac86a3ce70796249253c3f8c SHA-256: 39fb306c6f7ecced34d5c782c0e2d4144d6616234c53d535fe7b42dab2237b34

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment T1071.001 Web Protocols

The file is a PDF containing embedded JavaScript, as indicated by multiple PDF-specific heuristics including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The critical ClamAV detection and the presence of a large, comment-padded JavaScript eval stager suggest it's designed to exploit vulnerabilities. The embedded JavaScript stream, named 'javascript_obj0006_000.js', is the primary artifact, likely responsible for downloading and executing a secondary payload. The document body was unreadable, but the technical indicators strongly point to a malicious exploit delivery mechanism.

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` `8290ec12394502c5381ab4a955dc6a643bb9003f058aa5537792112a2ae9fe1c`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	424951 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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