PDF malware analysis — malicious · 313ee276baf03913

MALICIOUS

PDF

5.0 KB Created: 2009-09-08 19:44:94 Authoring application: Eblasha 7.7.7.6 (via PDF Library 8.3.2.8)

MD5: 9a8876b18bd298590b820cacc0bc0026 SHA-1: f8e1229d8c29781d269632a58bd4fb18d2279af0 SHA-256: 313ee276baf03913516deb1200001a069256b313f3e9644d90f59387fc023ab6

266 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1071.001 Web Protocols T1059.007 JavaScript

The PDF file contains multiple critical heuristic firings indicating exploitation of CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992. These vulnerabilities are leveraged to execute embedded JavaScript. The extracted JavaScript, identified as 'numeric_charcode_stage_000.js', is flagged by ClamAV as Js.Exploit.Shellcode-18, suggesting it is responsible for downloading and executing a secondary malicious payload. The PDF's metadata and structure further indicate obfuscated JavaScript execution.

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.
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
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_000.js` `8d312865ee6f219cdd9f40f760573830faebf74e47e206442be8c60f79621bc5`	pdf-javascript-stream	PDF /JS object 13 at offset 0x37C	27106 bytes
`numeric_charcode_stage_000.js` `237b474f5840a9d30f37e7eaa5e34cd2c3d928e69d4e2fece789c2955c207677`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x3C9	8304 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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