PDF malware analysis — malicious · 4a2a9d612686ece6

MALICIOUS

PDF

6.5 KB

MD5: 0a7262d874ca9764e77fe366b4b80235 SHA-1: 0d5fb421858f6bef1ef16dff4b510685049b8216 SHA-256: 4a2a9d612686ece6c3841f52412489905d4806726ff41e54c23410d7d0541570

288 Risk Score

Malware Insights

This PDF file is flagged as malicious by multiple heuristics, including a critical detection for the CVE-2009-0658 exploit targeting Adobe Reader's JBIG2Decode filter. The presence of embedded JavaScript, specifically a stream identified as 'javascript_obj0006_000.js', indicates that the exploit likely aims to download and execute a secondary payload. The ClamAV detection 'Pdf.Dropper.Agent-7212046-0' further supports its role as a dropper.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 9

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: Pdf.Dropper.Agent-7212046-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7212046-0
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
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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` `97cb59ff84e9e4a1a6a9dbc76be9664277431b370fd53b30393035ef1bd96436`	pdf-javascript-stream	PDF /JS object 6 at offset 0x216	5319 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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