PDF malware analysis — malicious · 13f1fa97c8741427

MALICIOUS

PDF

831.7 KB

MD5: 798112c06624ceb7dd11af7f2e2e34a5 SHA-1: bfa70682328e06bb2091c3a56ff6587b587420f2 SHA-256: 13f1fa97c8741427c547f175d4a8d6d7d5b2e032c2e1400fb68bdf10d2a02799

236 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains JavaScript that utilizes eval() and String.fromCharCode, indicating obfuscated code execution. Heuristics suggest this JavaScript is part of an exploit cluster designed to launch and drop an embedded file. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, contributing to the overall malicious intent of the document.

Machine Learning

Nyx PDF Classifier suspicious score 0.4974

Heuristics 10

JPXDecode + active content — JPEG2000 CVE-family indicator high CVE related PDF_JPX_CVE_2018_4990_RELATED

PDF uses /JPXDecode (JPEG2000) alongside JavaScript, XFA, or RichMedia indicators. This matches the delivery pattern for Adobe Reader JPEG2000 parser exploit families, including CVE-2018-4990, but does not prove the exact malformed JP2/JPX primitive.
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.
exportDataObject + nLaunch — embedded-file launch-on-open dropper critical PDF_JS_EXPORT_LAUNCH_DROPPER

PDF JavaScript calls exportDataObject() with nLaunch set, which extracts the document's embedded file and launches it in its default application. This is a launch-on-open dropper: the embedded file is the payload. No benign workflow auto-launches an extracted PDF attachment. (matched in decompressed stream)
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (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. (matched inside decoded stream)
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. (matched inside decoded stream)
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload (matched inside decoded stream)
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)
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/tiff/1.0/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/exif/1.0/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/AcrobatAdhocWorkflow/1.0/
- http://ns.adobe.com/xap/1.0/rights/
- http://www.w3.org/1999/xhtml
- http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 11

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_002_off00002f27.js` `a7bf3968f6b1b5f6b67bb60ebcbd115943ea3ce09c131c900db6ef041f717dda`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2F27	13131 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 19 eval/decoder/string-building token(s).
`stream_003_off00003d30.js` `ef75178dc5c726c246732f82b203eb7fdcdccb7fa928ca5048a0e18ac01608f9`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3D30	9287 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 7 eval/decoder/string-building token(s).
`stream_005_off0000471e.js` `8a26308eea9c72525f80851b2d9bb98f352e95cbed376f6dfeb351ee9daaab86`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x471E	14878 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 9 eval/decoder/string-building token(s).
`stream_006_off00005604.js` `9ffe3b3cb04406be0fe049a27115b496dfd3681c12826d0d072ad5e38b55591d`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x5604	3139 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`stream_007_off00005a80.js` `2cf85655b5e4504a07c876fda3c661c0038610a346de305a642d9f0223bb5037`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x5A80	44450 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 8 eval/decoder/string-building token(s).
`stream_009_off00007ef7.js` `2dd59078323996f941d300e3a789a09fc6b09245a06f5a91de2e94a41c8a58d9`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x7EF7	8739 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`stream_050_off00074d2e.js` `1f35848a578d5dec75082793dbe07885cab8b763c3b8cf119746a8c5faee9e81`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x74D2E	2852 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`stream_051_off00075219.js` `80a6b8fd0ad629fdc498643b69b950d757215796a4f1a1a0046e79eaefd4fe76`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x75219	788 bytes
`objstm_1338_00.bin` `e530df7b5a9bee3e3b41a75984b6cc697feb00ce1c23033661da77e63d5acaef`	pdf-objstm-decoded	PDF /ObjStm 1338 0 obj (inflated)	3738 bytes
`objstm_0196_00.bin` `62692f13b3f11a67f20596b08c22a2d51166fb9235d45f3c3a0317e5b4d79d94`	pdf-objstm-decoded	PDF /ObjStm 196 0 obj (inflated)	38463 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`objstm_0197_00.bin` `4c43e601d348ada9ea7109d5a5ed23a5b263689ed5959b72e30d0e2148a4800d`	pdf-objstm-decoded	PDF /ObjStm 197 0 obj (inflated)	13538 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).

Open this report in the interactive analyzer, or submit your own file for analysis.