PDF malware analysis — malicious · 5611dd18a3759fd5

MALICIOUS

PDF

7.5 KB

MD5: 2f8282405a920c44d55a8463822a9180 SHA-1: 921e978008a16c2887a290ebb58ad601819af4ee SHA-256: 5611dd18a3759fd5c5dd148fe7aa53c59c825431228ed65c746f5d375507bf48

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF document exhibits high-confidence indicators of maliciousness, including obfuscated JavaScript and JBIG2 decoding with active content. The embedded JavaScript stream, named 'javascript_obj0006_000.js', is the primary artifact suggesting the file's intent. While the exact script functionality is obscured, its presence within a PDF and the associated heuristics strongly indicate it's designed to download and execute a secondary payload, a common technique for initial access or further infection.

Heuristics 7

JBIG2 + active content high CVE related PDF_JBIG2_ACTIVE_CONTENT

JBIG2Decode appears with JavaScript/XFA/RichMedia — a related indicator for JBIG2 parser-exploit families including CVE-2021-30860 and CVE-2009-0658, but not a unique CVE fingerprint.
ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
JBIG2Decode filter medium PDF_JBIG2

JBIG2 image decoder present — historically used in zero-click exploits
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.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `2b3fce4e9183b00e3aac9125398a9c0f6cee7b8efdb45a842ce8f31fb9ef6165`	pdf-javascript-stream	PDF /JS object 6 at offset 0x23D	5856 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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