PDF malware analysis — malicious · 591a379780f9b14f

MALICIOUS

PDF

179.9 KB

MD5: d4c3c01cc9d6b16aba1bfe33d1f71a00 SHA-1: 7aad3c472400dfe0ece50adfc7cef3e0e1ef1391 SHA-256: 591a379780f9b14fdab32165d6582e3f07a1d805c0158c8543a7b6829e1d3b8d

318 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript and exploits multiple known vulnerabilities (CVE-2009-0927, CVE-2007-5659, CVE-2008-2992) related to PDF object handling. The embedded JavaScript, identified as 'legacy_pdfkit_stage_000.js', is heavily obfuscated but is designed to download and execute a secondary payload. ClamAV detections on the main file and extracted artifacts further confirm its malicious nature. The primary attack vector is likely user interaction with the malicious PDF, triggering the exploit chain.

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: Pdf.Exploit.Agent-36114 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36114
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_obj0008_000.js` `b8ae372125186bd9539334fbd08671933da446e8d1cbc33d1b60bbd57a78cf2a`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	2687 bytes
Detection ClamAV: Pdf.Exploit.Agent-36307 Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `7157b7a4668733d7950d53ff809995b6bae9a550dcf16436c3985319ad23b320`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xC9A	20075 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 11 eval/decoder/string-building token(s).

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