PDF malware analysis — malicious · f587940ac5ad4515

MALICIOUS

PDF

4.5 KB Created: 2010-01-25 06:13:29 Authoring application: afa819

MD5: 8d13de7e5902aef348d965ceae59a24a SHA-1: 244dc5e27e89de042b1d70c93d469af2cf646b49 SHA-256: f587940ac5ad451546b723a31ba2affbce8d01951db869c9e3b3efc060d432cf

258 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains multiple critical heuristic firings indicating exploitation of CVE-2009-4324, CVE-2009-0927, and CVE-2007-5659. These vulnerabilities are used to execute embedded JavaScript. A deobfuscated JavaScript file, 'legacy_pdfkit_stage_000.js', was extracted and detected by ClamAV as 'Js.Exploit.Shellcode-18'. This strongly suggests the script is designed to download and execute a secondary malicious payload.

Heuristics 7

media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324

PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (identified after JavaScript deobfuscation)
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)
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.
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0012_000.js` `495a154467852d9005684990ac5d6f5da35458bcffdb52ca1db4e491ec6eb0b6`	pdf-javascript-stream	PDF /JS object 12 at offset 0x20E	110 bytes
`javascript_obj0028_001.js` `f6b4934d9ab5c1165500a15f12aac445f3a828d3ab4dd9f03ad604ae1148c587`	pdf-javascript-stream	PDF /JS object 28 at offset 0x2CE	335 bytes
`legacy_pdfkit_stage_000.js` `4610f9ffafcf2249dfbf75c710590ba09a777e18abd0584a43fef33b711dbbc4`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x476	7684 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 16 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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