PDF malware analysis — malicious · 3336c7be053c62d1

MALICIOUS

PDF

429.0 KB Created: 2009-08-06 08:45:36 -03:00

MD5: bd87ef0734278b8a18e64f661caffd51 SHA-1: 9bf7223dae318c1c20e192a5bce41693a5c80aa3 SHA-256: 3336c7be053c62d1e1dd36bcb31068b031af4c666e8d9269d0a5f1a198cd0772

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1559.002 Component Object Model Hijacking

The PDF file exhibits multiple indicators of malicious activity, including embedded JavaScript, a Flash object, and decompressed streams. The presence of `unescape()` calls and the ML classifier's high confidence score suggest active obfuscation and malicious intent. The embedded JavaScript and Flash content are likely used to execute arbitrary code or exploit vulnerabilities within the PDF reader.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 8

RichMedia (Flash) high PDF_RICHMEDIA

PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
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
PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE

PDF has 1 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.
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/xap/1.0/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`opening_animation.swf` `d04331f429e99986b93b458669feef032ef55d0f5bad422e7c27627e1c63ece6`	pdf-embedded-file	PDF EmbeddedFile object 29 at offset 0x55DC0	1165 bytes
`javascript_obj0040_000.js` `29fa8938ad180ed3f1018f40b9e3dd1e0f1135f00700f4c0c1cd8003f2190dd9`	pdf-javascript-stream	PDF /JS object 40 at offset 0x56902	2840 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`stream_010_off00056547.bin` `dd4a08ef95b64758a8ea6d5cb2ee744c41706311e6c4cc18f2a8acf7ad6568d3`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x56547	445 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`stream_011_off000566e3.bin` `8caf59e19b5aa422782f2760efb67ed56789c31f766a552ec882a6f4142c0da4`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x566E3	446 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`stream_012_off0005680d.bin` `b7a35940215241b3b15ea9604abd063e0c1bf5c9390bf6603b064abc7698ae06`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x5680D	445 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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