PDF malware analysis — malicious · faf73c99f9fcdcd3

MALICIOUS

PDF

12.2 KB Created: 2009-11-23 19:45:17 Authoring application: PDF Library 10.4.8 (via PDF Library 3.8.4)

MD5: ecbcc25ff38170c6d4b39df995f6382e SHA-1: e5f96fd93c6f3d30ed8cf7b049243ab3c5569a84 SHA-256: faf73c99f9fcdcd3abc0b5482f996190acc08e6faef177e49df8b1e4987a8a33

278 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1059.007 JavaScript

The PDF exploits multiple known vulnerabilities including CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992, indicating a targeted exploit kit. Static analysis identified embedded JavaScript, which was further deobfuscated into 'legacy_pdfkit_stage_000.js'. This script is flagged by ClamAV as 'Js.Exploit.Shellcode-18', strongly suggesting it downloads and executes a second-stage payload. The attack pattern is consistent with exploiting PDF reader vulnerabilities to deliver further malware.

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` `27fac43b27d574ec2910350fcc5bb79ccad43f602689a0032a97bfcda900248f`	pdf-javascript-stream	PDF /JS object 7 at offset 0x268	37684 bytes
`legacy_pdfkit_stage_000.js` `2669de17ef1147a8db026a1e81009049acba5b01df7654975bf7e3c0d6ee2da3`	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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