PDF malware analysis — malicious · 1e0ea14ac4e6cace

MALICIOUS

PDF

118.4 KB

MD5: 8314ff5ff10303dda3db1c616888b157 SHA-1: 7800ea040faba3af26e785e15968069717cce4c8 SHA-256: 1e0ea14ac4e6cace016acbc2c3b86166c95d9678d83ac1a71b5f7d1375942bf6

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains multiple JavaScript streams, including one with a large comment-padded eval stager. The presence of 'eval()' and 'String.fromCharCode' calls, along with the ClamAV detection 'Pdf.Exploit.Agent-36086', strongly indicates the execution of obfuscated JavaScript intended to download and execute a second-stage payload. The document body was unreadable, but the heuristic firings and ClamAV signature are sufficient to determine the malicious intent.

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` `e6981efc47b99d8c939d10f304dfb9205d3595405cb8596449c7f911f07638fa`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627021 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` `21c3f2199284cfe63d12620fa1c516483edfaabb026dc2cceb9110449621ef31`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 582 long base64-like blob(s).

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