PDF malware analysis — malicious · 961c0ebb008368fd

MALICIOUS

PDF

2.2 KB

MD5: cb87d082d45929f115e492457d09994d SHA-1: d47fbe17b912cd2c414625f884d7c211bfb241f4 SHA-256: 961c0ebb008368fd2c89e4e56005a053ce7c766d3dba11c464808bc18b463358

166 Risk Score

Malware Insights

MITRE ATT&CK

T1027 Obfuscated Files or Information T1204.002 Malicious File: Malicious File

The PDF file contains embedded JavaScript, which is heavily obfuscated using `eval()`, `unescape()`, and `String.fromCharCode()`. This obfuscation is a strong indicator of malicious intent, likely to conceal the execution of a secondary payload. The presence of these JavaScript functions and the ClamAV detection as 'Pdf.Exploit.Agent-36082' strongly suggest the file is designed to exploit PDF vulnerabilities and download further malicious content.

Heuristics 7

ClamAV: Pdf.Exploit.Agent-36082 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36082
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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_obj111611_000.js` `772da696bdb365f3f1eb4ea6af881baad391be62f3591b19f2f9827fcc4c9b53`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x7DD	479 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `d4ca9c7227527687da41c546662c9be492a5b97250adf04c2a9270ab892df0aa`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x189	2828 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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