PDF malware analysis — malicious · a7b5b19372242bca

MALICIOUS

PDF

2.2 KB

MD5: bc5e0872ab5027f4a6bb0fe9c14b99b6 SHA-1: 5bb5b98a9c3868dbf79083bc5f37448ca5593acf SHA-256: a7b5b19372242bca40ffc14b8d91215a9051cfa7bffdc72623e7fdaf86ec079f

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 Scripting: JavaScript T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript, which is heavily obfuscated using `eval()` and `unescape()` calls. The heuristics indicate this JavaScript is designed to execute malicious code, likely downloading and running a second-stage payload. ClamAV detection further confirms its malicious nature. The obfuscated JavaScript and the PDF structure strongly suggest an exploit delivery mechanism.

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 0x7E2	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` `ebf82c4d9c64acc97e3cb5172bae5c4363b1c0f54081f07673f90630186e1b88`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x189	2834 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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