PDF malware analysis — malicious · 26b07ae3381d44b4

MALICIOUS

PDF

15.7 KB

MD5: 3a70a3af1875dcded4cf711edba1d65f SHA-1: d9574eb912c218ff2e04949d9ab37340e10e01dd SHA-256: 26b07ae3381d44b4bd19896fc0e20a16309dfec594a685e80c2fd371bc4b796b

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, including a large, obfuscated stager that utilizes `eval()` and `String.fromCharCode()`. This script is designed to decode and execute a payload, as indicated by the 'PDF_JAVASCRIPT', 'PDF_JS', 'PDF_EVAL', and 'PDF_JS_LARGE_COMMENT_PADDED_EVAL' heuristic firings. The 'CLAMAV_DETECTION' heuristic identifies the file as 'Pdf.Exploit.Agent-36086', confirming its malicious nature and likely exploit functionality. The embedded JavaScript is the primary mechanism for delivering the exploit.

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` `410a4fff65219e4bef5e5625212b195e31756befac5739d2b6a7d39bcd028921`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	424828 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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