PDF malware analysis — malicious · a555b1254dcc36d4

MALICIOUS

PDF

7.5 KB

MD5: 7b73721b8c9b17871a731376639d31ba SHA-1: cdb11fe99ad9f27b01f22b06463c6efb564eb161 SHA-256: a555b1254dcc36d472bb65ffbd2f204d4afdc90907c9b216649633d8daa0ffcf

238 Risk Score

Malware Insights

The file is a PDF document that contains obfuscated JavaScript. Critical heuristics indicate it exploits CVE-2009-0658, a known vulnerability in Adobe Reader related to JBIG2Decode filters. This exploit is designed to execute arbitrary code, likely to download and run a secondary payload. The presence of obfuscated JavaScript and the specific exploit targeted strongly suggest malicious intent.

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` `7768aec9ab646ac2832090fdfb147bc29d6fe14df9c71bcf581e8f175f334929`	pdf-javascript-stream	PDF /JS object 6 at offset 0x22E	5888 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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