PDF malware analysis — malicious · f1c93ba4453689ec

MALICIOUS

PDF

6.8 KB

MD5: aa91c998ed0862448d337b9e55244edb SHA-1: 9d8a7044256fb2ad72e7772a8af30569a0d2dd52 SHA-256: f1c93ba4453689ec3088ae85f90898d262a6489043bb8c2d72e5c90cef71c481

238 Risk Score

Malware Insights

The PDF file contains embedded JavaScript and triggers multiple high-severity heuristics related to PDF exploits, specifically targeting CVE-2009-0658 via JBIG2Decode. The embedded JavaScript stream, named 'javascript_obj0006_000.js', is likely responsible for executing the exploit and downloading a secondary payload. The ClamAV detection further confirms its malicious nature.

Heuristics 8

Adobe Reader JBIG2Decode generic heap-spray exploit critical CVE likely CVE_2009_0658_GENERIC_SPRAY

PDF combines JBIG2Decode image streams with JavaScript heap-spray or decoder scaffolding. This is likely CVE-2009-0658-family Adobe Reader JBIG2 exploitation, but it lacks the stricter Reader-9 version gate or decoded page-word shellcode fingerprint required by the exact rule.
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` `733e676fd44b21ab9371e5992bfec4f314e404c23297db536c7458f0a2ffd278`	pdf-javascript-stream	PDF /JS object 6 at offset 0x239	5139 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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