PDF malware analysis — malicious · 4cbc622a797d358c

MALICIOUS

PDF

2.34 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: de0baa1fef39d4e056cf50b1d2fbb167 SHA-1: 38ce8ad25bc5395c38d3bebcdb710b24314c33b3 SHA-256: 4cbc622a797d358cd050ca407e4d2e5373437ab2cc7c8c031f9077405d802953

204 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment T1027 Obfuscated Files or Information

The PDF contains multiple embedded JavaScript streams, with several heuristics indicating obfuscation techniques such as eval() and unescape(). The presence of U3D/3D content and a high ML classifier score strongly suggest exploitation of a PDF vulnerability, likely related to CVEs affecting 3D parsers. The obfuscated JavaScript is designed to download and execute a second-stage payload, though the exact nature of the payload cannot be determined from the provided evidence.

Machine Learning

Nyx PDF Classifier malicious score 0.9789

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 30

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0256_000.js` `944051d30594ca6efe0954bd229ef0dff7411d1d69c5df07ab95a0bd8a667340`	pdf-javascript-stream	PDF /JS object 256 at offset 0x3EF71	205126 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_off0004a8c0.bin` `dc1250c0552f7440815c7bfc5c2e6b02f2757b4f7eb7293bbc3d62b504103c6d`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4A8C0	2884412 bytes
`stream_082_off00207b87.js` `cd71be21612064d09365dc0a183a55ba7aec15b62cb5f0da798d439957a109e6`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x207B87	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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