PDF malware analysis — malicious · 50cdb49f34509d69

MALICIOUS

PDF

12.5 KB Created: 2009-11-24 19:45:49 Authoring application: PDF Library 8.4.10 (via PDF Library 1.8.5)

MD5: 254bdc781db8e81336faf814c1dca8bf SHA-1: defd82218e05451c107527c3c91f39517ebe4bf4 SHA-256: 50cdb49f34509d690b39c0f2a2f6a9f3639abfded4ad0e865e6bec41cdfbcbab

220 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1204.002 Malicious File

This PDF file exploits multiple known Adobe Acrobat vulnerabilities including CVE-2009-0927 (Collab.getIcon), CVE-2007-5659 (Collab.collectEmailInfo), and CVE-2008-2992 (util.printf). These exploits are used to execute obfuscated JavaScript, which is then deobfuscated into a file named 'legacy_pdfkit_stage_000.js'. The primary function of this script is to download and execute a second-stage payload. The confidence is high due to the critical nature of the identified CVEs and the presence of executable JavaScript.

Heuristics 7

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)
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` `90083287ee024470edc5d7a7902ebeddf520106cab5db592e452fce48413b01a`	pdf-javascript-stream	PDF /JS object 7 at offset 0x268	38222 bytes
`legacy_pdfkit_stage_000.js` `5731987f661b4b05c5a6c26b7d2bc0da3aaccdcd840e96480763e97764f0f1e3`	deobfuscated-js	numeric array subtract-key decoded JavaScript at offset 0x268	9874 bytes
Detection ClamAV: No threats found 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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