PDF malware analysis — malicious · 4a15d1cbfe861218

MALICIOUS

PDF

8.5 KB Created: 2009-12-16 19:44:63 Authoring application: PDF Library 2.8.10 (via PDF Library 7.3.9)

MD5: ab3d3a2dd21e18a40cd572fb63893215 SHA-1: 6281cafd5eef7b24a1463d3c2d83a9a7b2f4d309 SHA-256: 4a15d1cbfe861218a10ea90cd77c10d0a97c1015a6470e820764f6d161bcf0f9

278 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF sample contains embedded JavaScript that leverages multiple critical vulnerabilities in Adobe Acrobat (CVE-2009-0927, CVE-2007-5659, CVE-2008-2992). The JavaScript is obfuscated but static analysis indicates it likely decodes and executes a shellcode payload, as confirmed by ClamAV detection 'Js.Exploit.Shellcode-18' on an extracted artifact. This points to a classic exploit-kit delivery mechanism.

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` `5089b549c90c04d179ce5e2ecc2175c7845c6b31bc7fd6fb5bcf3f3f7d579eca`	pdf-javascript-stream	PDF /JS object 7 at offset 0x268	36828 bytes
`legacy_pdfkit_stage_000.js` `ac9da334877e1eb9baecd59638de45d92046ac8ad0208ea35ea4733f2fa918c7`	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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