PDF malware analysis — malicious · 958e21c41b70eb99

MALICIOUS

PDF

132.3 KB Created: 2009-03-05 21:22:26 +08:00 Authoring application: Acrobat Web Capture 8.0

MD5: 77b8ec1daae1b6b0f92eaa1fcbad0c3a SHA-1: dde355c73502d7080570b748608c407b3e6f7ce1 SHA-256: 958e21c41b70eb99369090ef71912375e34fc008f2f068ebded92bbc028c4cae

278 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.001 PowerShell

This PDF file contains embedded JavaScript and exploits the CVE-2009-0658 vulnerability, which is a known heap-spray exploit for Adobe Reader. The presence of JBIG2Decode filter with active content further indicates an exploit attempt. The primary function appears to be the execution of arbitrary code, likely for downloading and executing a second-stage payload, as suggested by the ClamAV detection name 'Pdf.Exploit.Agent-19090'. No specific malware family could be confidently identified.

Heuristics 10

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.Exploit.Agent-19090 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-19090
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
Secondary embedded PDF body has suspicious static findings high POLYGLOT_CHILD_PDF_STATIC_TRIAGE

A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
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 7

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0054_000.js` `76b9a9d595e071c01fab427db3229805067700ca8167c99a8d39a6f6869c3734`	pdf-javascript-stream	PDF /JS object 54 at offset 0x9495	867 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`stream_009_off00001c1f.bin` `6a71966cad617bfb05c2fc57e09517130f7abf80fb7d2cd8d6f9a72dd0ff8cc6`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1C1F	8958 bytes
`stream_012_off0000a650.bin` `a286a724917c4ed12e23c56fdbe9b05a086df706402e840df93ca822a639bf8f`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xA650	867 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`stream_013_off0000b7b5.bin` `6300b36f22ef6578b0f03e4e9331a4dc1cfa3ef51cfced50c1ce2d725dd82351`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xB7B5	867 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`stream_014_off0000c848.bin` `9fdeb4cf92d3ba004fe834e1ec15e7554d02b14121596b2b2948628aa9003bc4`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xC848	868 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`jbig2_00_off00008305.bin` `a8a931537fd567cb5415ecfef8b7817f4acb7f5c26bd9cb2b4a4b89b235dd6fc`	pdf-jbig2-stream	PDF JBIG2 stream at offset 0x8305	3739 bytes
`polyglot_child_pdf_off0001f973.pdf` `d47cb91852c5d88d6da030fb8ed118716c0216d3beea6357215e47155c0d59e9`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x1F973	6123 bytes

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