PDF malware analysis — malicious · b554c4b2401aac27

MALICIOUS

PDF

2.2 KB

MD5: 713ca1934dbc20aacb2e8f1c7847d178 SHA-1: d02ae13745e434fc73ff68c20fe5f444df1e532a SHA-256: b554c4b2401aac2738d9a4eaa1b25191cea34d0bc1743fa3927d193355f05aa5

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript

This PDF file contains embedded JavaScript, which is heavily obfuscated using eval() and unescape() calls. The JavaScript is designed to exploit vulnerabilities within the PDF reader. The ClamAV detection 'Pdf.Exploit.Agent-36082' further confirms its malicious nature. The primary attack vector appears to be the execution of this obfuscated JavaScript.

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 0x7D2	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` `78f3c61e5ed897ba592d2005e6c80e48de95efd44e0712231337bd5ab5dcb88f`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x189	2810 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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