PDF malware analysis — malicious · f763205a6547f3d1

MALICIOUS

PDF

118.6 KB

MD5: 6be097ae0abfc20e07dd8ab4626413dc SHA-1: 5151e9ad04a83238d52211ba1c8fc5ad5e31d813 SHA-256: f763205a6547f3d1c8bbfa1b9f2d21abe6492ac5ac550ae297c0681f3c8ac262

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious JavaScript

The PDF contains embedded JavaScript, including a high-severity 'Large comment-padded JavaScript eval stager' heuristic firing. This indicates the script is designed to obfuscate its true purpose, likely to download and execute a second-stage payload. The ClamAV detection 'Pdf.Exploit.Agent-36086' further supports the malicious nature of the file. No document body text was available for analysis, so the rationale is based solely on the script and heuristics.

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` `2307f3c04fd14d79e29bc5f21160611206351708e9990a40e33d7f3cf38f5ddf`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626890 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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