PDF malware analysis — malicious · b98567efc6ad0570

MALICIOUS

PDF

76.2 KB Created: 2009-12-31 19:44:91 Authoring application: PDF Library 4.10.10 (via PDF Library 9.6.8)

MD5: 124691a0b75c2462761fe3d757df7b66 SHA-1: d1309b20376df9b1e4a8c61f75caa7508300d048 SHA-256: b98567efc6ad057001f5a8931d1fb9481fb8279205d5071ee2a6813201e63ee5

338 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF sample contains multiple critical heuristic firings indicating exploitation of CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992 through embedded JavaScript. The ClamAV detection of 'Pdf.Dropper.Agent-7216908-0' and the extracted artifact 'legacy_pdfkit_stage_000.js' with 'Js.Exploit.Shellcode-18' signature further confirm its malicious nature. The embedded JavaScript is likely designed to download and execute a second-stage payload, a common technique for dropper malware.

Heuristics 9

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: Pdf.Dropper.Agent-7216908-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7216908-0
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` `7f910f6873d2f35ecd72eec3103ff5609dec909848e32932362fb81c3b0dd22f`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	38522 bytes
`legacy_pdfkit_stage_000.js` `2628ebbd4557cfb43fa33659c5088ba67fbc8a1844801fa03440e63cb103443d`	deobfuscated-js	numeric array subtract-key decoded JavaScript at offset 0x1A5	9958 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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