PDF malware analysis — malicious · b94069e76824776f

MALICIOUS

PDF

2.2 KB

MD5: 456dd544a1649fd5b84390a81e7a02b8 SHA-1: 872a0611602c4f25083ecce392e83f3489ad534f SHA-256: b94069e76824776fe4b9e6905fbaaeb32ea1997ea801eca8105552b13bc94396

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() and unescape() calls. The heuristic firings indicate the presence of JavaScript actions and streams, with critical detection by ClamAV as Pdf.Exploit.Agent-36082. The obfuscated JavaScript is designed to execute, likely downloading and running a second-stage payload. The extracted file names 'javascript_obj111611_000.js' and 'legacy_pdfkit_stage_000.js' are noted as suspicious artifacts.

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 0x7D8	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` `f15d0fe24123afa90bae2e51d9a63b6990aba8828a10b35185f858d0419088e3`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x189	2816 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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