PDF malware analysis — malicious · f757aca6e62ed1e4

MALICIOUS

PDF

2.77 MB Created: 2006-11-07 11:38:03 -07:00 Authoring application: Adobe Illustrator 11.0 (via Deep Exploration 5 5.0.6.1889 Release)

MD5: 2bcc95181651ee4f33d2fd4e9f6fb52b SHA-1: 412bb1a386fd1b97b2f01aaacb84abd55b0848e9 SHA-256: f757aca6e62ed1e4b2b87305976bc1b033c00237482553e075c26409bcf2de89

206 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1071.001 Web Protocols

The PDF file exhibits multiple high-severity heuristic firings related to embedded JavaScript, including eval() and unescape() calls, indicating obfuscated malicious code. The ML classifier also flagged the PDF as malicious with a high score. The presence of U3D content suggests a potential exploit vector. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, although the exact nature of the payload cannot be determined from the static analysis alone. The benign URLs extracted are likely unrelated to the malicious functionality.

Machine Learning

Nyx PDF Classifier malicious score 0.9487

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 29

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0223_000.js` `8bc029484311b564d663e63457202b0f155b78da9d4fe777414ddd923fbc414c`	pdf-javascript-stream	PDF /JS object 223 at offset 0x7B591	201954 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`stream_033_off00025d99.js` `c2cfe62289e85a5de51e74766c51e3885d21d1f9e873d9eb4a30162192432ebe`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x25D99	22268 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`stream_034_off00026e42.js` `8318cfbb06a989fbf9e85a57016222466e46af8ad73bfeaba24d2a84f97e6481`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x26E42	17945 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`stream_035_off00027bfe.js` `b89d1dc94c6752251533a68dbbbff2e3664eb8f8ec1eae658c84d61abf6b272e`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x27BFE	10321 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 8 eval/decoder/string-building token(s).
`stream_039_off0002a33d.js` `d8f14cfafa3c03678e5ff35f701bdd62552412ced26fc79fc2950e1670eb1106`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2A33D	7147 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`stream_040_off0002aab2.js` `4015e032519fe09c2125cd1c8b0afe77cb0b1ebb4b901fd3ce95443d03d0e440`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2AAB2	2656 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`stream_041_off0002aede.js` `6b90b88c18883c688269f08c79fa872098622d3f019c36db3551651baf370f70`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2AEDE	10670 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 10 eval/decoder/string-building token(s).
`stream_045_off0002d39e.js` `85e818c3e948c1ba3c1bd21fd1a336ab5e0aa057068ee54fbb39f50cfacf99b9`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2D39E	7394 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`stream_046_off0002db30.js` `24da1f1fe8bd43c35d2681ffed6b729b22882f60c72d739751808aa04d27cdca`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2DB30	2758 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`stream_047_off0002df5d.js` `d12c1ba8623a48297c3120c2d1075cd786d812ec68ef5dcd78d0acd5eb98d1f0`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2DF5D	10467 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 9 eval/decoder/string-building token(s).
`stream_049_off0002f804.js` `90114c0d3b099b78b3901483d819fd961f54ceee50f637f9b96cc2d8756ae4ce`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2F804	7420 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).
`stream_050_off0002ffbb.js` `e74b886445cd2b2b72eaa85280d69d39cfeea997437ef83969d83510cff2b7ee`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2FFBB	2532 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`stream_051_off000303ac.js` `b0ced4c0736652e87d948f9a258d89a25115c72efc25bc905a10f9ffe15386c1`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x303AC	10189 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 7 eval/decoder/string-building token(s).
`stream_053_off00031661.js` `bbe5462dff538e4c762b844ae26be18d05ea1ba04dcd3555421dab8f834e2065`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x31661	7138 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`stream_054_off00031da4.js` `05257e8805c2fd9de9e0dd76497b1ddc1f27bd657af0465843d552cb5b559df3`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x31DA4	2536 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`stream_055_off00032191.js` `cdf262cc54dbd21f64c550849a95d856876ecb3d8f60b9f4d3e7af1472662455`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x32191	10492 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 9 eval/decoder/string-building token(s).
`stream_057_off00033427.js` `251f202a2f48f4cf50dbe7ad008ece1d683ff823af1199db78ab81c3409e6bda`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x33427	7180 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`stream_058_off00033b8c.js` `0a8ebb1f6423e7516ad1ce66bfe63b45a9177edb1d9f14cc972f83bd0cc53716`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x33B8C	2795 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`stream_059_off00033faa.js` `dec9c1ab3410769e817610e212fac1ee6a59b7acdf409a4e4007d48fc0a6592b`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x33FAA	10487 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 8 eval/decoder/string-building token(s).
`stream_061_off00035399.js` `b82a9be713f15e49297f6c2a57c55f9eb8925fac72ab69df6958f946fffc2932`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x35399	7445 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`stream_062_off00035b52.js` `00616f2ee7537947cade8eddb9c713970aa17d256789346ecfc610bd48e5ba7e`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x35B52	2524 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`stream_063_off00035f49.js` `7c8f5045f1a9cbc3c4972b920d5459cbf9d8f1ea8faff72df5d910cc73dae60c`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x35F49	10440 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 9 eval/decoder/string-building token(s).
`stream_065_off000371ed.js` `83da19540fe1155419c9447af6746e3d22d54e164830fa31ef79da4d7bcde0b4`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x371ED	7177 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`stream_066_off00037975.js` `1bcdd99a74e80832caef99dc35bd9582f111818bd03f16dc035ffea0348ad9d5`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x37975	2748 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`stream_069_off00086cd3.bin` `11e1de70ba73b5bd6006b95e36a61b16aa1b73f58a6e3558e3d4492bb3242f28`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x86CD3	2128412 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.98, consistent with packed or encrypted content.
`stream_070_off0028ab4a.js` `cd71be21612064d09365dc0a183a55ba7aec15b62cb5f0da798d439957a109e6`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x28AB4A	171324 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`objstm_0234_00.bin` `7c85e7419941b479238870d655587f4f4e5ae75b9e8c75f8bb31a5189b05cd9f`	pdf-objstm-decoded	PDF /ObjStm 234 0 obj (inflated)	524 bytes
`objstm_0235_00.bin` `314624bf6299e328bdf8c3aa48c9cbbfd34f65ff9402cc03127d26e4f0d72685`	pdf-objstm-decoded	PDF /ObjStm 235 0 obj (inflated)	3831 bytes
`font_00_sfnt_off000010b0.bin` `f39f99e2d4b021d4eac703afe26d32ad26f128c442f2089910c21b1f323fc85d`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B0	79301 bytes

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