PDF malware analysis — malicious · 1949901cb6f9d607

MALICIOUS

PDF

7.2 KB

MD5: cedae44f79b6606b0d9b882e8e365130 SHA-1: 1539bea815fe597efb8a45e331e07327ed408250 SHA-256: 1949901cb6f9d607127b24fffaefa4fc691cbd25c292db754f869f3600d7de60

308 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file contains obfuscated JavaScript that exploits the CVE-2009-0927 vulnerability (Collab.getIcon). The deobfuscated JavaScript is designed to download and execute a secondary payload, indicating a multi-stage attack. The high confidence is due to multiple critical heuristic firings and ML classification.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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. (matched in decompressed stream)
PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
Generic recovered JavaScript exploit stage high PDF_GENERIC_STAGE_RECOVERY

Bounded static stage recovery exposed hidden JavaScript through generic transforms such as null-byte collapse, percent decoding, marker replacement, arithmetic character codes, fromCharCode, numeric arrays, numeric-array minus-key decoders, alphabet-index arrays, /Producer half-difference metadata arrays, hex literals, marker-stripped Base64 literals, custom 6-bit XOR table decoders, or repeated-marker hex carriers. This rule is emitted only when the recovered stage contains exploit-like Acrobat JavaScript or shellcode markers.
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_obj0006_000.js` `1c4f0bca14e4a4b04bf8de12422a7f48b3f2698680d5d9c8137b3059334dec24`	pdf-javascript-stream	PDF /JS object 6 at offset 0x1AB	6134 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).
`generic_stage_recovery_000.js` `ebfce4af9019766e330e7aba3532a340c4b074ae59caedd0e34b3358ff4a8149`	deobfuscated-js	generic stage recovery percent-decode from JavaScript object 6 at offset 0x1AB	6132 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `44b133f078cae7b0deb1d5fb2d21b7fa30af93f2705a583e40aec4a32844572d`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x214	512 bytes

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