PDF malware analysis — malicious · a9f826faae44d945

MALICIOUS

PDF

340.1 KB Created: 2009-03-13 16:50:38 +08:00 Authoring application: Acrobat Web Capture 8.0

MD5: 94078a123319f2c6c52635ae1615c51e SHA-1: 097a8da1654d5eff463a8b590de9badaa520ba2c SHA-256: a9f826faae44d945b1f452e46f86b9d55e9f046690e455691620034b252cc7d4

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1204.002 Malicious File

The PDF file contains embedded JavaScript that triggers a heap-spray exploit targeting CVE-2009-0658 in Adobe Reader. This exploit is designed to download and execute a second-stage payload. The presence of JBIG2Decode with active content further indicates malicious intent. No specific family could be identified, but the exploit vector is clear.

Heuristics 8

Adobe Reader JBIG2Decode heap-spray exploit critical CVE likely CVE_2009_0658

PDF combines JBIG2Decode image streams with a Reader 9 JavaScript heap-spray stage. This is the in-the-wild Adobe Reader/Acrobat JBIG2Decode exploit shape associated with CVE-2009-0658.
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.
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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://ns.adobe.com/xap/1.0/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/pdf/1.3/

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0027_000.js` `266e00ca3d7ec0109b0318dd8d869c90daf6a2ec1208ffd2c74bb2ce91900b1d`	pdf-javascript-stream	PDF /JS object 27 at offset 0x6BCC	1808 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`stream_001_off00002374.bin` `6a71966cad617bfb05c2fc57e09517130f7abf80fb7d2cd8d6f9a72dd0ff8cc6`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2374	8958 bytes
`jbig2_00_off000055da.bin` `b7129b45393226b187b9422e94fdc0725110b9d8979f5342bcbfb47371a5470e`	pdf-jbig2-stream	PDF JBIG2 stream at offset 0x55DA	4945 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.73, consistent with packed or encrypted content.

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