PDF malware analysis — malicious · 4a881ab67a7a7cad

MALICIOUS

PDF

118.7 KB

MD5: 375f284b1b7f0c9fa881f47909304598 SHA-1: 8df070687412393ce81260c641eecc34e8841495 SHA-256: 4a881ab67a7a7cad0a339f025ed93d0fd21ec1595814567ca6f7c25565aa0142

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious JavaScript

The PDF file contains multiple heuristic firings indicating embedded and obfuscated JavaScript. Specifically, the 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_EVAL' rules suggest active scripting. The 'PDF_JS_LARGE_COMMENT_PADDED_EVAL' rule points to a common stager technique. The ClamAV detection 'Pdf.Exploit.Agent-36086' confirms the malicious nature. The primary IOC is the extracted JavaScript file, which is likely responsible for executing 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` `af249982b5b809a523b564ec596538a47ad2a7b83d502e70fab9fd8e5e3d0cec`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627198 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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