PDF malware analysis — malicious · 89e9bb08975dcc66

MALICIOUS

PDF

9.0 KB Created: 2009-12-15 19:45:36 Authoring application: PDF Library 7.1.1 (via PDF Library 8.9.10)

MD5: da4fb215e8e9a9d19a77accaedee0f95 SHA-1: 89ff33cec19a96cfd80565c0d85d63ee26de35f9 SHA-256: 89e9bb08975dcc66d34476b0787fa0887f6afc8d2e76b8648e8c08f61f84dff6

278 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF sample contains multiple critical heuristic firings indicating exploitation of CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992 via embedded JavaScript. The deobfuscated JavaScript, legacy_pdfkit_stage_000.js, is flagged by ClamAV as Js.Exploit.Shellcode-18, suggesting it contains shellcode. This indicates the PDF's primary purpose is to exploit these vulnerabilities to download and execute a secondary malicious payload.

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.
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `cb57973e0caab4644293d290ad435a603d4184008f5ad2a86597d9265097724f`	pdf-javascript-stream	PDF /JS object 7 at offset 0x268	38200 bytes
`legacy_pdfkit_stage_000.js` `af22220ba95dee57375fa84022d413601793d17421b3334023004ef17a37e8ab`	deobfuscated-js	numeric array subtract-key decoded JavaScript at offset 0x268	9874 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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