PDF malware analysis — malicious · e2f5d72cc5d63b4c

MALICIOUS

PDF

71.6 KB Created: 2009-11-16 19:47:76 Authoring application: PDF Library 2.9.10 (via PDF Library 10.9.9)

MD5: 6f6b8bee1f4a6738c348fffd0fc3f9f1 SHA-1: 2987a54d97b9a1cd3b1ea77ab99ac9b6ddc8c4ca SHA-256: e2f5d72cc5d63b4c8f37973acb141325b940740b01a1fc96b944450edcaa69d6

338 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF leverages multiple critical vulnerabilities (CVE-2009-0927, CVE-2007-5659, CVE-2008-2992) to execute obfuscated JavaScript. Static analysis recovered a deobfuscated JavaScript file, 'legacy_pdfkit_stage_000.js', which likely serves as the second-stage payload. The presence of these specific CVEs and the embedded JavaScript strongly indicates an exploit kit delivery mechanism. The file was detected by ClamAV as Pdf.Exploit.Agent-36110.

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` `e785122e0d5e619aebd59745e2f70dd7f730bff8ca913956e75b9b9278a03d88`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	36170 bytes
`legacy_pdfkit_stage_000.js` `5e963983e74e25c430a4706dc2971b89f49c989a0c6895268b0dcb59c1f15847`	deobfuscated-js	numeric array subtract-key decoded JavaScript at offset 0x1A5	9610 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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