PDF malware analysis — malicious · f91f076b18a6fd38

MALICIOUS

PDF

8.4 KB Authoring application: Xvewvekui

MD5: e14e3f2bd89593b2c495f3d08871fdbb SHA-1: 4284001739864b1784bb372ff067046ec73ec1fc SHA-256: f91f076b18a6fd38c82f87da6cc659523ceb66691d8c21626550febab9f0b9a2

260 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that is triggered by the 'OpenAction' property, a common technique for exploiting PDF readers. Heuristics indicate the use of 'eval()' and 'unescape()' functions, along with a specific critical alert for CVE-2009-0927 (Collab.getIcon), confirming an exploit attempt. The ClamAV detection 'Pdf.Exploit.Agent-35649' further supports this. The embedded JavaScript streams, particularly 'legacy_pdfkit_stage_000.js', are likely responsible for downloading and executing a secondary payload, although the exact URL or mechanism is obfuscated.

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)
ClamAV: Pdf.Exploit.Agent-35649 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35649
OpenAction trigger high PDF_OPENACTION

PDF has an /OpenAction — code runs automatically when opened
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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` `4f8a97340e7cfe4ea4bcadb5859338857cc7644b929b3080a7e0a5efa9318c0f`	pdf-javascript-stream	PDF /JS object 7 at offset 0x57D	6699 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 11 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `e02e2a3bae5c73bf215cd72464cd0cd24899c02b4725be7065c7303db8f7b64c`	deobfuscated-js	string-concatenation normalized Acrobat API aliases at offset 0x57D	276 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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