Malicious PDF — malware analysis report

Static analysis result for SHA-256 65f5dc3e3495ef5e…

MALICIOUS

PDF

649.4 KB Created: 2010-07-14 14:01:17 -04:00
MD5: 6332f6858cfa6570e6423ad64ab6a15f SHA-1: a9a8a1f23d7d5e28665e3f7e8780b286844e7d1c SHA-256: 65f5dc3e3495ef5ee76e774d70734137e90961f741ff1a5b4c8d6e8c070d3475
70 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains embedded JavaScript and exhibits characteristics related to CVE-2018-4990, indicating an attempt to exploit a vulnerability for client execution. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, though its exact function is obscured by the PDF structure. The benign URLs extracted do not provide further indicators.

Machine Learning

  • Nyx PDF Classifier clean score 0.0064

Heuristics 7

  • 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.
  • 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)
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/xap/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://www.adobe.com/go/reader
    • http://ns.adobe.com/pdfx/1.3/
    • http://ns.adobe.com/photoshop/1.0/

Extracted artifacts 11

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00000710.js
d798b469e6816e336a447d84369e24a4464a3781f75cb40617378b306ceab7db		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x710 7161 bytes
stream_024_off00006a03.bin
4db42116bcc23c28d852d3d18181a2198e162969a2d2e24970c5ff5089dde4ec		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x6A03 24249 bytes
stream_029_off00023756.bin
d2852d15484cfbd27b7627938fd200a26932512d63c06576a0a4a9da026883f0		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x23756 43528 bytes
stream_031_off000309dd.bin
6e804a5b46d7e122ecb5d4fd4c677da9a1b66e2a6ba115c21fd43256e51e2833		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x309DD 29450 bytes
stream_033_off0003981d.bin
cce68f01f874d4fa50aa08fbc45a482775b692d35e03f7d8852554fb058ac005		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3981D 53329 bytes
stream_034_off000454d0.bin
4e1044c3f8d9914780dd144edb2a20629ec7983b715c194c1be58daf41b06fca		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x454D0 56428 bytes
stream_038_off0005ad2d.bin
1236e314894ff55de28b439da9d83b5c69ff12b4a30147077689ce4b7dcfff72		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5AD2D 15618 bytes
stream_043_off0006f7a0.bin
e22d663c2d51a7e0fefb0742266845824ecab697408e892592591c3c2316ee5b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x6F7A0 25720 bytes
stream_044_off0007492c.bin
fe0d9c0d819d028c89a90f7f8005ab66cf316cfbb322150f5e30869d44110830		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x7492C 27260 bytes
font_00_cff_off00003c47.bin
46d6cefde37d45d18fcc5c29216199cff91c0e64b0a4892dc2e1aa4d3a90f4b5		 pdf-font-stream PDF embedded font (cff) at offset 0x3C47 2466 bytes
font_01_cff_off00004712.bin
8c6b806d6b4dbadc63b2abff6201ac51cb5e88f43d6bacc387340cd039ec4f43		 pdf-font-stream PDF embedded font (cff) at offset 0x4712 1671 bytes

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