Malicious PDF — malware analysis report

Static analysis result for SHA-256 980d392a2bd4b537…

MALICIOUS

PDF

231.0 KB Created: 2010-11-12 16:05:24 +08:00 Authoring application: PScript5.dll Version 5.2.2 (via Acrobat Elements 8.0.0 (Windows))
MD5: e909909bbcdd38ab7d9500704a954054 SHA-1: 7fde749cdc6ccb6b23123408c72f46b69c0cb141 SHA-256: 980d392a2bd4b53752bdb0eb8ab193ae8593e9f993899ec30beaa022ad934df0
258 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious Link T1566.002 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, detecting it as Win.Trojan.Agent-36159. High-severity heuristics indicate the presence of embedded JavaScript and RichMedia content, potentially exploiting CVE-2023-26369. A secondary embedded PDF was also found with suspicious static findings. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, though the exact mechanism is obfuscated.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

Heuristics 9

  • TrueType bitmap font + active content — CVE-2023-26369 related high CVE related PDF_CVE_2023_26369_RELATED
    PDF embeds a TrueType font with bitmap tables (EBDT/sbix/CBDT) alongside exploit delivery indicators — CVE-2023-26369 exploits the sfac_GetSbitBitmap function in Adobe's libCoolType for arbitrary code execution. This CVE was actively exploited in the wild, but this rule does not validate the malformed EBLC/EBDT primitive.
  • Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE
    A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
  • ClamAV: Win.Trojan.Agent-36159 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Agent-36159
  • RichMedia (Flash) high PDF_RICHMEDIA
    PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector (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)
  • 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/

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_014_off00025dbe.bin
a66c3df807ab863bd1e46c5460a4da107b5dea35201a1182512aeccb597c70ce		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x25DBE 219252 bytes
objstm_0027_00.bin
667b2c75ccf7ac530ab7ab1335ed88701c878c9bd33ce7626a853b18be32e7d1		 pdf-objstm-decoded PDF /ObjStm 27 0 obj (inflated) 1170 bytes
icc_00_off0002184a.icc
2b3aa1645779a9e634744faf9b01e9102b0c9b88fd6deced7934df86b949af7e		 pdf-icc-profile PDF ICC profile at offset 0x2184A 3144 bytes
polyglot_child_pdf_off00020a69.pdf
0507202c60d2d7da728c03dddc531645e6c88e0b1d06fad0e18987e8054cc16f		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x20A69 102834 bytes
polyglot_child_pdf_off0003842e.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x3842E 6125 bytes

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