PDF malware analysis — malicious · 1ec75af22a32df33

MALICIOUS

PDF

118.6 KB

MD5: 840f1ea2966f7660dedd7f4db73a5ffb SHA-1: 9b63313ef7120584862b5b3111bf57a08464777a SHA-256: 1ec75af22a32df33a6dc22c25ff0382a489b1e7b66763b24b324574a93901412

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains embedded JavaScript, including a large comment-padded eval stager and multiple eval() calls. This JavaScript is heavily obfuscated, making its exact function difficult to determine, but it strongly suggests the execution of arbitrary code. The presence of ClamAV detection for 'Pdf.Exploit.Agent-36086' further confirms its malicious nature. The primary attack vector appears to be the exploitation of PDF vulnerabilities to run this embedded script, which likely downloads and executes 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` `5d404d2e0f91da261eb0350d5e721dd8ffea4f994c7ad4c912a86214c8060834`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626976 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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