PDF malware analysis — malicious · b5e6b725a4c4ec0d

MALICIOUS

PDF

73.9 KB Created: 2009-12-12 19:44:19 Authoring application: PDF Library 8.3.3 (via PDF Library 9.6.2)

MD5: a3a123235b818dbb2858a0e5a229a263 SHA-1: 00611fc54555890397e5173e9207a177fbd8c760 SHA-256: b5e6b725a4c4ec0da2b089f5e71850504b62af6d584caac235049973ee357bfb

338 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF exploits multiple Adobe Reader vulnerabilities, specifically CVE-2009-0927 (Collab.getIcon), CVE-2007-5659 (Collab.collectEmailInfo), and CVE-2008-2992 (util.printf), through embedded and obfuscated JavaScript. Static analysis recovered a deobfuscated JavaScript file named 'legacy_pdfkit_stage_000.js', indicating the PDF's primary function is to act as a dropper for a second-stage payload. The ClamAV detection 'Pdf.Exploit.Agent-36110' further confirms its malicious nature.

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` `6aa5563a017050822aaedabcfe1bf254b7951f17f1303de8cf444b92305dff0e`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	37337 bytes
`legacy_pdfkit_stage_000.js` `2d0c941094fa581f641f42a3b164d23a3122eb3201ca25ab3c45e44812745c50`	deobfuscated-js	numeric array subtract-key decoded JavaScript at offset 0x1A5	10012 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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