PDF malware analysis — malicious · befddb8fb46c31e9

MALICIOUS

PDF

199.3 KB Created: 2009-05-14 12:40:13 +08:00 Authoring application: PScript5.dll Version 5.2.2 (via Acrobat Distiller 7.0 (Windows))

MD5: f0c4756738aed7c7798b623a318959c9 SHA-1: 1a144ee33b127953e82005cc0519f3d4079c8dcd SHA-256: befddb8fb46c31e92882ab5534bbdf93961199f77f47205d5210d867a55d2d79

216 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 JavaScript

This PDF file contains embedded JavaScript that exploits the CVE-2009-0658 vulnerability in Adobe Reader. The exploit is designed to execute a heap-spray payload, indicating an attempt to compromise the user's system. The ML classifier strongly supports the malicious nature of this file.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 9

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.
Optional Content Group with action trigger low PDF_OPTIONAL_CONTENT

Optional Content Group (layer) co-occurs with an action trigger — content can be selectively hidden from viewers or scanners while the action still fires on open
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/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0011_000.js` `60013647f65915440fea2210c9f54b093561f299268f0782c4385d3b3dfe4634`	pdf-javascript-stream	PDF /JS object 11 at offset 0x5E3	520 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`stream_012_off00008b27.js` `32b1d36f8d1de1a814c809b19720323719b6e3c64e55683553a894782be03aa7`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x8B27	520 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`jbig2_00_off00001e7d.bin` `ae056040f664f15ee950ebdd3c9903f22581e7365c3752026160e65162ce7cd2`	pdf-jbig2-stream	PDF JBIG2 stream at offset 0x1E7D	3986 bytes
`font_00_sfnt_off000030ec.bin` `054efc047363b9aa71725e85e1e2afadc15e8323b274edb5732ed315505f4d74`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x30EC	179816 bytes

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