PDF malware analysis — malicious · c9263bc10a4cb8dc

MALICIOUS

PDF

12.2 KB Created: 2009-11-07 19:49:17 Authoring application: PDF Library 3.8.4 (via PDF Library 10.5.6)

MD5: 3186a644462418846ffe6d47e5c2f0da SHA-1: 6c6ae2724a3bee3544e5d98c8410cec5ce2f2414 SHA-256: c9263bc10a4cb8dcbd1c713b10fc2b86729f2b7b3fb8db8882e5a5dfa59c0c03

278 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious JavaScript

This PDF file contains embedded JavaScript that exploits multiple critical vulnerabilities including CVE-2009-0927 (Collab.getIcon), CVE-2007-5659 (Collab.collectEmailInfo), and CVE-2008-2992 (util.printf). The JavaScript is obfuscated but static analysis indicates it decodes a payload, likely a second-stage downloader, as evidenced by the ClamAV detection 'Js.Exploit.Shellcode-18' on an extracted artifact. The primary intent appears to be the execution of this malicious script to compromise the user's system.

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` `6f1e0a1bffea0ada1c13b5f94dc9eb74387395e7e96f4bd70be55184a434cc1a`	pdf-javascript-stream	PDF /JS object 7 at offset 0x268	37737 bytes
`legacy_pdfkit_stage_000.js` `012d6d3afffb797a2bbc72ad235c2fe627aef59dcc6701c0030d074f50c5368f`	deobfuscated-js	numeric array subtract-key decoded JavaScript at offset 0x268	9964 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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