PDF malware analysis — malicious · dbbeb802fb28daff

MALICIOUS

PDF

2.2 KB

MD5: 7c0b620c40540dcc8ed5f9457bb379cc SHA-1: e5510fd87cfa8e05d4b6b142654cd6606310b315 SHA-256: dbbeb802fb28daffc3b29e1f9a879b8d7e7789188cf6118ece6bb23c7b7624a6

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. High-severity heuristics like PDF_EVAL and PDF_UNESCAPE, along with PDF_FROMCHARCODE, point to the use of obfuscation techniques within the JavaScript to hide its true functionality. The ClamAV detection of 'Pdf.Exploit.Agent-36082' further confirms its malicious nature. The primary intent appears to be the execution of obfuscated JavaScript, likely to download and execute a second-stage payload, as suggested by the presence of deobfuscated JS streams.

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 0x7D1	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` `a0b63b2dc08262bac85d57850752adfad10893da199773a05e20514821b05f65`	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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