PDF malware analysis — malicious · 5239db9c8c4bc8ee

MALICIOUS

PDF

118.5 KB

MD5: 1f85d92ac3cc576cedd3ef6d839a7234 SHA-1: 49647223d94235c1c250c1bb20cd61437445a0d5 SHA-256: 5239db9c8c4bc8eefa40a3f6f3aa181fc10d729e6ad56038e2f5e65efe3b65f9

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The file is identified as a malicious PDF by ClamAV (Pdf.Exploit.Agent-36086). Static analysis revealed embedded JavaScript streams with high-confidence heuristics for eval() calls and a large comment-padded JavaScript eval stager. These indicate the script is designed to de-obfuscate and execute arbitrary code, a common technique for exploiting vulnerabilities or downloading further malicious content. The presence of JavaScript actions and streams strongly suggests an attempt to leverage JavaScript for malicious purposes within the PDF.

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` `54ab7ff20ea5699741e42c3463c09d38551e64545e8c51819ec0e635fc795c6e`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626522 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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