PDF malware analysis — malicious · f16995ba5b58e16d

MALICIOUS

PDF

503.4 KB Created: 2006-11-07 11:38:03 -07:00 Authoring application: Adobe Illustrator 11.0 (via Deep Exploration 5 5.0.0.1399 Release)

MD5: f5c737c257395b2c1c3d2dea7ce21aa0 SHA-1: f9d860955286ee8dc40615a200eb29533358d013 SHA-256: f16995ba5b58e16dc714be58c9ee2b0680341e434990f385e48ddd3e822d2f2a

204 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains embedded JavaScript that utilizes eval() and unescape() functions, indicating obfuscated code execution. The presence of U3D/3D content and a specific heuristic flagging it as CVE-related suggests exploitation of a PDF viewer vulnerability. The ML classifier also flagged this as malicious. While no specific URLs or executable payloads were directly extracted, the techniques used strongly suggest a drive-by download or exploit delivery mechanism.

Machine Learning

Nyx PDF Classifier malicious score 0.9131

Heuristics 10

U3D/3D content in PDF — Adobe Reader 3D parser CVE-family indicator high CVE related PDF_U3D_CVE_RELATED

PDF contains U3D (Universal 3D) or 3D annotation content — CVE-2011-2462 and CVE-2009-3953 are critical vulnerabilities in Adobe Reader's U3D processing that allow arbitrary code execution. U3D content in PDFs is extremely rare in normal documents.
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)
Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD

PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
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)
Optional Content Group with action trigger low PDF_OPTIONAL_CONTENT

Optional Content Group (layer) co-occurs with an action trigger — content can be selectively hidden from viewers or scanners while the action still fires on open
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/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/g/img/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 9

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0053_000.js` `2456d42a60220e270706fc9b246591d0c615ff7716eca8c609685c65bfe593be`	pdf-javascript-stream	PDF /JS object 53 at offset 0x1DE0C	141736 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`stream_013_off0001cbd7.js` `31ca3056d5d1740b89d5c9e8a1d59b034aee4ac100a2a15bf4014684116c1fae`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1CBD7	8610 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`stream_014_off0001d4fc.js` `8bf3d0416cb60050a72a9ab5f96d93dec2b71c7b890f6fa7fbbbfa9d965534cd`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D4FC	6761 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`stream_016_off00025f7c.bin` `cf3e36730f800e857a5847609019f8e408832fc76c6bf524211ebca412959be9`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x25F7C	370996 bytes
`stream_017_off0005e854.js` `6697a8469141108183ca41ba674d81adff36430fcfaf946f48a84cd78bc6f465`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x5E854	108700 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`objstm_0064_00.bin` `e59573b7210fe3f56c8cde61a2f1b54b2adac862805b660e6efb3bd3a43458d9`	pdf-objstm-decoded	PDF /ObjStm 64 0 obj (inflated)	520 bytes
`objstm_0065_00.bin` `19fa0cb867707e6255f39b505eab3cf9a4619b341c01527fc7a296e506877fb7`	pdf-objstm-decoded	PDF /ObjStm 65 0 obj (inflated)	1037 bytes
`font_00_sfnt_off00000f07.bin` `f39f99e2d4b021d4eac703afe26d32ad26f128c442f2089910c21b1f323fc85d`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF07	79301 bytes
`font_01_cff_off0000eb43.bin` `ff2bd39b1311329d9bedf20dcc32a5c5691647192c7f1c6f455126503a909ee9`	pdf-font-stream	PDF embedded font (cff) at offset 0xEB43	1558 bytes

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