PDF malware analysis — malicious · 1f824a4f8d559f66

MALICIOUS

PDF

12.1 KB Created: 2009-10-22 19:48:49 Authoring application: PDF Library 4.3.6 (via PDF Library 10.7.10)

MD5: 3247f8a14cbe44cac452ad0cf69a896c SHA-1: ffc181b9a77f89e2dfe5b564f1261d1e01ac302e SHA-256: 1f824a4f8d559f660b1f56008f6a49a57c7e85644a892c9a7e7199b67afa7feb

278 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 JavaScript

This PDF exploits multiple known Adobe Acrobat vulnerabilities including CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992. The embedded JavaScript, identified as 'legacy_pdfkit_stage_000.js', is heavily obfuscated but static analysis indicates it likely downloads and executes a second-stage payload, as suggested by the ClamAV detection 'Js.Exploit.Shellcode-18'. The attack pattern involves luring the user to open a malicious PDF that leverages these exploits.

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` `a6baeb263cd3260333510be5f66080d978728e4422d7935b5d90c2851252a6de`	pdf-javascript-stream	PDF /JS object 7 at offset 0x268	37407 bytes
`legacy_pdfkit_stage_000.js` `aa03db03a02486410293d05158a50432919ec30716364836fee05da2f9f1d254`	deobfuscated-js	numeric array subtract-key decoded JavaScript at offset 0x268	9778 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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