PDF malware analysis — malicious · 6e8ab9a1276e30ba

MALICIOUS

PDF

2.23 MB Created: 2006-11-07 11:49:36 -07:00 Authoring application: Adobe Illustrator 11.0 (via Deep Exploration 5 5.0.6.1889 Release)

MD5: 0055b6dbaaac340f189c6ed15d18ccf8 SHA-1: 8795ce55269fa37b789f67139ba771961798a241 SHA-256: 6e8ab9a1276e30baa52f93bee83ff1ad5074d782b4c351df63c151c707796f01

266 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains multiple embedded JavaScript streams, with critical heuristics indicating the use of eval() and unescape() functions, commonly used for obfuscation and exploit execution. The presence of a U3D/3D content vulnerability indicator (CVE-related) further suggests exploitation of a specific PDF parser weakness. The primary JavaScript stream, 'javascript_obj0256_000.js', uses extensive URL encoding and string concatenation, typical of malware attempting to download and execute a second-stage payload. The exact URL or payload is heavily obfuscated and not directly recoverable from the provided evidence.

Machine Learning

Nyx PDF Classifier malicious score 0.9817

Heuristics 11

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.
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.
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/
- https://www.verisign.com/repository/RPA0
- https://www.verisign.com/repository/CPS��
- https://www.verisign.com
- https://www.verisign.com/repository/verisignlogo.gif0�
- https://www.verisign.com/CPS
- https://www.verisign.com/repository/CPS
- http://www.adobe.com/typehttp://www.adobe.com/type/legal.html

Extracted artifacts 30

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0256_000.js` `3eb88f055030c210997b09a41eb4ae24bdbd8e5e213e1184d96965dc141e69bf`	pdf-javascript-stream	PDF /JS object 256 at offset 0x3EF71	202991 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`stream_036_off00026b35.js` `15c4a9fcb8bc8fe324ee0e3d3fbbb245de27f64edba04eb77d3ad86fad4f3bff`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x26B35	22268 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`stream_037_off00027bde.js` `8318cfbb06a989fbf9e85a57016222466e46af8ad73bfeaba24d2a84f97e6481`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x27BDE	17945 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`stream_038_off000289c9.js` `b89d1dc94c6752251533a68dbbbff2e3664eb8f8ec1eae658c84d61abf6b272e`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x289C9	10321 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 8 eval/decoder/string-building token(s).
`stream_042_off0002b108.js` `d8f14cfafa3c03678e5ff35f701bdd62552412ced26fc79fc2950e1670eb1106`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2B108	7147 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`stream_043_off0002b87d.js` `4015e032519fe09c2125cd1c8b0afe77cb0b1ebb4b901fd3ce95443d03d0e440`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2B87D	2656 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`stream_044_off0002bca9.js` `6b90b88c18883c688269f08c79fa872098622d3f019c36db3551651baf370f70`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2BCA9	10670 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 10 eval/decoder/string-building token(s).
`stream_048_off0002e169.js` `85e818c3e948c1ba3c1bd21fd1a336ab5e0aa057068ee54fbb39f50cfacf99b9`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2E169	7394 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`stream_049_off0002e8fb.js` `24da1f1fe8bd43c35d2681ffed6b729b22882f60c72d739751808aa04d27cdca`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2E8FB	2758 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`stream_050_off0002ed28.js` `d12c1ba8623a48297c3120c2d1075cd786d812ec68ef5dcd78d0acd5eb98d1f0`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2ED28	10467 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 9 eval/decoder/string-building token(s).
`stream_054_off00032280.js` `90114c0d3b099b78b3901483d819fd961f54ceee50f637f9b96cc2d8756ae4ce`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x32280	7420 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).
`stream_055_off00032a37.js` `e74b886445cd2b2b72eaa85280d69d39cfeea997437ef83969d83510cff2b7ee`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x32A37	2532 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`stream_056_off00032e28.js` `b0ced4c0736652e87d948f9a258d89a25115c72efc25bc905a10f9ffe15386c1`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x32E28	10189 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 7 eval/decoder/string-building token(s).
`stream_060_off00035287.js` `bbe5462dff538e4c762b844ae26be18d05ea1ba04dcd3555421dab8f834e2065`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x35287	7138 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`stream_061_off000359ca.js` `05257e8805c2fd9de9e0dd76497b1ddc1f27bd657af0465843d552cb5b559df3`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x359CA	2536 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`stream_062_off00035db7.js` `cdf262cc54dbd21f64c550849a95d856876ecb3d8f60b9f4d3e7af1472662455`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x35DB7	10492 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 9 eval/decoder/string-building token(s).
`stream_066_off000380e8.js` `251f202a2f48f4cf50dbe7ad008ece1d683ff823af1199db78ab81c3409e6bda`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x380E8	7180 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`stream_067_off0003884d.js` `0a8ebb1f6423e7516ad1ce66bfe63b45a9177edb1d9f14cc972f83bd0cc53716`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3884D	2795 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`stream_068_off00038c6b.js` `dec9c1ab3410769e817610e212fac1ee6a59b7acdf409a4e4007d48fc0a6592b`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x38C6B	10487 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 8 eval/decoder/string-building token(s).
`stream_072_off0003b399.js` `b82a9be713f15e49297f6c2a57c55f9eb8925fac72ab69df6958f946fffc2932`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3B399	7445 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`stream_073_off0003bb52.js` `00616f2ee7537947cade8eddb9c713970aa17d256789346ecfc610bd48e5ba7e`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3BB52	2524 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`stream_074_off0003bf49.js` `7c8f5045f1a9cbc3c4972b920d5459cbf9d8f1ea8faff72df5d910cc73dae60c`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3BF49	10440 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 9 eval/decoder/string-building token(s).
`stream_078_off0003e263.js` `83da19540fe1155419c9447af6746e3d22d54e164830fa31ef79da4d7bcde0b4`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3E263	7177 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`stream_079_off0003e9eb.js` `1bcdd99a74e80832caef99dc35bd9582f111818bd03f16dc035ffea0348ad9d5`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3E9EB	2748 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`stream_081_off0004a76b.bin` `5db568fa076e203fc8e27e597925aa5ecc49c9f3b2bc9c9a4557a319067c27ef`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4A76B	2850040 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.75, consistent with packed or encrypted content.
`stream_082_off002223c4.js` `cd71be21612064d09365dc0a183a55ba7aec15b62cb5f0da798d439957a109e6`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2223C4	171324 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`objstm_0267_00.bin` `0b0d272b75744fd65991a38e8edb55466d01fd4d5d2b1b775dca99da7e73f4d9`	pdf-objstm-decoded	PDF /ObjStm 267 0 obj (inflated)	524 bytes
`objstm_0268_00.bin` `b14cf8625cf28a62dd3ffa238b71372931928293b97cb4018cae9e713c2ab27e`	pdf-objstm-decoded	PDF /ObjStm 268 0 obj (inflated)	3871 bytes
`font_00_sfnt_off000010ef.bin` `f39f99e2d4b021d4eac703afe26d32ad26f128c442f2089910c21b1f323fc85d`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10EF	79301 bytes
`font_01_cff_off0000ed7f.bin` `ff2bd39b1311329d9bedf20dcc32a5c5691647192c7f1c6f455126503a909ee9`	pdf-font-stream	PDF embedded font (cff) at offset 0xED7F	1558 bytes

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