PDF malware analysis — malicious · 2a4c7bac44e64bf8

MALICIOUS

PDF

260.7 KB Created: 2009-07-21 10:51:50 +08:00 Authoring application: Acrobat PDFMaker 6.0 for Word (via Acrobat Distiller 6.0 (Windows))

MD5: e2d78e5de4da564df533f5587950d8fc SHA-1: d79ecb5d333f1d551f5b450706e7b4556400a3c6 SHA-256: 2a4c7bac44e64bf89260f2ba545f054459d565e5a06d739935f144352b6e6f0d

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_UNESCAPE. The critical CVE_2009_0927 firing, specifically related to Collab.getIcon, strongly suggests exploitation of a known vulnerability in Adobe Reader. The embedded JavaScript is likely used to download and execute a secondary payload, as suggested by the ClamAV detection of Pdf.Exploit.Agent-35646. The presence of a suspicious extracted JavaScript file further supports this.

Heuristics 9

Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927

PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (matched in decompressed stream)
ClamAV: Pdf.Exploit.Agent-35646 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35646
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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/iX/1.0/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/pdfx/1.3/
- http://ns.adobe.com/photoshop/1.0/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://purl.org/dc/elements/1.1/

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0075_000.js` `c6f86ceeeb74e85c2898f7210a1ecc3cec1bd503b7fac80c526d4b661faffea4`	pdf-javascript-stream	PDF /JS object 75 at offset 0x4038B	6267 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 7 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`font_00_sfnt_off0000117d.bin` `a8e6f6cda9871a1ab15430669671b6673c51f464eedd45e5e7802238601e14de`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x117D	49896 bytes
`font_01_sfnt_off00002071.bin` `0d3577b2a695d38177db1be084e2055b996a7e34b2eec02eb4344b784d889f06`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x2071	290368 bytes

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