PDF malware analysis — malicious · d9cf0aed4540c4a8

MALICIOUS

PDF

118.6 KB

MD5: 1a00e0834db684b19464fa79b72c3c16 SHA-1: 3112cd2d3d5aded028233385e1869cd23e3ede1a SHA-256: d9cf0aed4540c4a8f643b42274d72db1dcbd60faf07c6b6b588d25c15be72576

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains multiple high-severity heuristic firings indicating JavaScript execution, including `PDF_EVAL` and `PDF_JS_LARGE_COMMENT_PADDED_EVAL`. The embedded JavaScript stream, `javascript_obj0006_000.js`, is large and heavily obfuscated, suggesting it acts as a stager. The ClamAV detection `Pdf.Exploit.Agent-36086` further confirms its malicious nature. The primary function appears to be the execution of obfuscated JavaScript, likely to download and execute a second-stage payload.

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` `01483b858e53af184e45407f5e5e181a2eca3ef2a2a0156389617b54540d4ed4`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626247 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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