PDF malware analysis — malicious · 86290be869f1059b

MALICIOUS

PDF

1.9 KB

MD5: 239eaca5f84bbee9f0ac5142cc5cac74 SHA-1: f3bee569e694786c11c5d7317dfb5125ec43e386 SHA-256: 86290be869f1059b5a03e11ec96c82352196b0321621c1d039f8e17d00a0d322

168 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious File

The PDF file contains obfuscated JavaScript that leverages the CVE-2009-0927 vulnerability (Collab.getIcon). The script uses eval() and unescape() functions, indicating it's designed to execute malicious code. The primary intent appears to be downloading and executing a secondary payload, as suggested by the heuristic firings and the presence of deobfuscated JavaScript. The file is classified as malicious due to this exploit.

Heuristics 7

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)
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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_obj111611_000.js` `433d6141b5fc932a52d94051061c1f7566cbde37bb51ce636d76e20ed4ab2bf6`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x6CF	297 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `ee71facdbe28d3a452b31739df02f745b8b471bf0f0a2e9ac862e936179a8540`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x189	2637 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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