PDF malware analysis — malicious · 1a445cf180929555

MALICIOUS

PDF

6.8 KB

MD5: 6ec718a589b807b044e9257bb574e5a9 SHA-1: 048f99413ee8655f9582f2a827f7b530cbc5c28e SHA-256: 1a445cf180929555e79b9dcd799c77930aeec84eb256b8e42a1042ca6fbf7236

238 Risk Score

Malware Insights

This PDF file is identified as malicious due to the presence of a critical exploit targeting CVE-2009-0658, which is a heap-spray exploit for Adobe Reader's JBIG2Decode filter. The file also contains embedded JavaScript, indicated by PDF_JAVASCRIPT and PDF_JS heuristics, and a specific ClamAV detection for obfuscated objects. The exploit's nature suggests it's designed to download and execute a secondary payload.

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` `8a5781761c60e21a89ed93ba735ac18f4fac93b6989c56e771744725e069e767`	pdf-javascript-stream	PDF /JS object 6 at offset 0x221	5005 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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