PDF malware analysis — malicious · ac382775e9d4b457

MALICIOUS

PDF

4.1 KB Created: 2009-09-03 19:48:46 Authoring application: Eblasha 6.2.1.10 (via PDF Library 5.9.2.10)

MD5: 636b716b83b4d825c2a9c7d2cb122c42 SHA-1: a067caaf1ab5ca2b3af0d12d9c70e64beb6b4033 SHA-256: ac382775e9d4b457479857993836e191497fadebdc3fa74528575358b9ac456d

304 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript that leverages multiple known vulnerabilities (CVE-2009-0927, CVE-2007-5659, CVE-2008-2992) related to JavaScript execution within PDF viewers. A critical heuristic identified an extracted JavaScript file, 'numeric_charcode_stage_000.js', which was flagged by ClamAV as Js.Exploit.Shellcode-18. This indicates the script is designed to download and execute a secondary malicious payload. The confidence is high due to the multiple critical vulnerability firings and the nature of the extracted artifact.

Heuristics 8

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. (identified after JavaScript deobfuscation)
Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992

PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (identified after JavaScript deobfuscation)
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
Suspicious extracted artifact high 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.
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.
ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85

ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_000.js` `eaa75b6f66e57eb846832e9d4b86ca944f4653cedb093f9f17644ee89cc15b20`	pdf-javascript-stream	PDF /JS object 13 at offset 0x37C	16960 bytes
`numeric_charcode_stage_000.js` `4b3a522ec161dd80fad1d2c7f0be4a23af0f14dcf7ce4a674195ed5a01b6ef28`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x3C9	5100 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 9 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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