PDF malware analysis — malicious · 26a9fa32fd1715ad

MALICIOUS

PDF

1.95 MB Created: 2008-04-28 12:17:40 +03:00 Authoring application: Aladdin Ghostscript 5.10

MD5: 0002c846da0018b85eb59bb5d109a063 SHA-1: a50879a9ae6767fb414ff63d04b9a82fb9c4fe57 SHA-256: 26a9fa32fd1715adea7789456dcd510df258b587a8bffad8478206aadef0eee4

204 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF contains multiple high-severity heuristic firings indicating the presence and execution of obfuscated JavaScript. The ML classifier strongly flagged this PDF as malicious. The presence of embedded JavaScript streams and the use of eval(), unescape(), and String.fromCharCode() suggest that the script is designed to deobfuscate and execute malicious code. The polyglot child PDF findings further indicate a layered malicious structure. The primary intent appears to be the execution of arbitrary code, likely to download and run a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9992

Heuristics 9

Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE

A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://ns.adobe.com/iX/1.0/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/

Extracted artifacts 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0016_000.js` `14786cb07a127fe038b0375d9b1383d4ed808aac12f9cc981ac7b35916c04fec`	pdf-javascript-stream	PDF /JS object 16 at offset 0x931	6892 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`stream_006_off00002efc.js` `0ca8823b41808c7ea461527b3101d70e2aca3e7b890113840279e8a49f25ead9`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2EFC	6892 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`stream_009_off000052aa.js` `6bff4c2b4e85832999c68c0d286d87dae3ccc82514234dbd4cdb821afcd63c02`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x52AA	3373 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`polyglot_child_pdf_off00002597.pdf` `84297792d1af0d047b9f7a2b16b74213efe79c1f8624a9c164a8e9f2bc744e2f`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x2597	2038377 bytes
`polyglot_child_pdf_off00004597.pdf` `83ad66efdc55ba7aea2f46c26c31d5d10d8b1180c8c705d854d38ae12185a06c`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x4597	2030185 bytes

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