PDF malware analysis — malicious · 39bfd79cfae279c2

MALICIOUS

PDF

3.6 KB Created: 2010-02-12 08:33:42 Authoring application: a63441

MD5: d987f27dc7e3d518810ba90be4ea5480 SHA-1: 96603392d32a3642e5d1a05b80954494125bd1b6 SHA-256: 39bfd79cfae279c287992a035af5e1661a4d5395dbf13ab2b05b67842a43bc60

258 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript that exploits multiple known vulnerabilities (CVE-2009-4324, CVE-2009-0927, CVE-2007-5659). Static triage identified a suspicious extracted JavaScript file, legacy_pdfkit_stage_000.js, which ClamAV detected as Js.Exploit.Shellcode-18. This indicates the PDF is designed to deliver and execute malicious shellcode, likely as part of a multi-stage attack.

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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0011_000.js` `669b8d2dfeab1f4e9fd81867156aa1c1771fc94fae86a461052798e89a2cb472`	pdf-javascript-stream	PDF /JS object 11 at offset 0xCB	1016 bytes
`legacy_pdfkit_stage_000.js` `7a09ac2d5e9bd4bd75def0bef9d1c04274a431859c3ea5a73b70281f780da159`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x3CE	6282 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 11 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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