PDF malware analysis — malicious · 4b4994d6ad28aca3

MALICIOUS

PDF

75.7 KB Created: 2009-12-30 19:47:64 Authoring application: PDF Library 10.5.7 (via PDF Library 10.8.9)

MD5: eba076f0d6c46d260a43a8e9adcee968 SHA-1: eff277f2d626ec61e845592930731eba6aa9f6b1 SHA-256: 4b4994d6ad28aca3251d721b0bb834b34e3c1ec9e876a9b39a42e579354164dd

338 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript that exploits multiple Adobe Reader vulnerabilities, specifically CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992, as indicated by critical heuristic firings. Static analysis recovered a deobfuscated JavaScript file ('legacy_pdfkit_stage_000.js') which likely serves as the exploit stage. ClamAV detections further confirm its malicious nature, identifying it as 'Pdf.Exploit.Agent-36110' and an extracted artifact as 'Js.Exploit.Shellcode-18'. The script's primary function is to download and execute a second-stage payload.

Heuristics 9

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: Pdf.Exploit.Agent-36110 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36110
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` `67b7c3694dce5a3d2beb7e904f7a32fae2d94572ae40bf88904c7d2ed8c8070b`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	38238 bytes
`legacy_pdfkit_stage_000.js` `3ce310d4ff668e808049962de68dec8c511c935a33eec76d5755d785bb356a55`	deobfuscated-js	numeric array subtract-key decoded JavaScript at offset 0x1A5	9958 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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