PDF malware analysis — malicious · b5456e24b6797646

MALICIOUS

PDF

118.5 KB

MD5: 940f8fbd2d822c6b41813d3d2f0ce533 SHA-1: 276732da3df1ab52e5d709d48a2986c4ffa132f7 SHA-256: b5456e24b679764629180ee3be5db0ebeaf9ed5edb138bbf0d5a648ef23245c4

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains multiple embedded JavaScript streams, with one exhibiting characteristics of a large comment-padded eval stager. The presence of eval() calls and String.fromCharCode further indicates obfuscated JavaScript intended to execute malicious code. ClamAV detection as 'Pdf.Exploit.Agent-36086' strongly suggests this is a known exploit. The primary function appears to be downloading and executing a second-stage payload, though the specific URL or payload could not be reconstructed due to obfuscation.

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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `1826cedba422d2b8320d6db9b0727b9fd3fa09097dfbf673a68c608c1670293c`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626354 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).
`legacy_pdfkit_stage_000.js` `404f785f8e679fd22e24298f15e000d538ae21e620f4ccea56e665aef0e6dded`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262116 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 623 long base64-like blob(s).

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