PDF malware analysis — malicious · 8216b0a7f4660001

MALICIOUS

PDF

12.5 KB Created: 2009-12-19 19:46:08 Authoring application: PDF Library 5.6.2 (via PDF Library 2.4.7)

MD5: 0f1a3e56ea9bd87c9f1a07bc5b4ec363 SHA-1: b55e7097e764767644382d6e84d415917c6b529b SHA-256: 8216b0a7f4660001c33f122b8b69f2deb28549e1320441e5d6c41d7bc4563381

278 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1059.001 PowerShell

The PDF file contains multiple critical heuristic firings indicating exploitation of CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992. These exploits target Adobe Reader vulnerabilities and are used to execute malicious JavaScript. An extracted JavaScript file, 'legacy_pdfkit_stage_000.js', was detected by ClamAV as 'Js.Exploit.Shellcode-18', further confirming the malicious nature of the embedded script. The script likely downloads and executes a second-stage 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` `14849d9801c338419d86dac486373093802797968a40474019232232abe73edd`	pdf-javascript-stream	PDF /JS object 7 at offset 0x268	38206 bytes
`legacy_pdfkit_stage_000.js` `5bd00654c11fdc554cf03ce201df6b93082218660ea4966114ec95ce16576968`	deobfuscated-js	numeric array subtract-key decoded JavaScript at offset 0x268	9880 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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