Malicious PDF — malware analysis report

Static analysis result for SHA-256 38636c88e0a5fcac…

MALICIOUS

PDF

336.9 KB Created: 2008-01-05 16:25:50 +01:00 Authoring application: LaTeX with hyperref package (via pdfeTeX-1.21a)
MD5: 925d86ec64c8a776f4618ce7666f1a76 SHA-1: 1b262a3adedaa91b4f32dd309d90e25db1f150d1 SHA-256: 38636c88e0a5fcac3aff36b14666fd806bea4b764de04da0e3b018ee8b132606
124 Risk Score

Malware Insights

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

The file is a PDF containing embedded JavaScript and references to 3D content, flagged as a CVE-related indicator. ClamAV identifies it as a dropper. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload from one of the extracted URLs. The presence of JavaScript actions and embedded JS streams strongly suggests an exploit attempt.

Heuristics 8

  • 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.
  • ClamAV: Pdf.Dropper.Agent-7249786-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7249786-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser exited 1. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://vcg.isti.cnr.it)/S/URI/Type/Action
    • http://meshlab.sourceforge.net)/S/URI/Type/Action
    • 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/pdf/1.3/
    • http://ns.adobe.com/pdfx/1.3/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://vcg.isti.cnr.it
    • http://meshlab.sourceforge.net

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0015_000.js
e6ec90c17a9979afc209d45a355c8a1ab0939cbe7191da9be7ac142d657cbf78		 pdf-javascript-stream PDF /JS object 15 at offset 0x665 2438 bytes
stream_009_off00028e47.bin
b1f937b9541d599e1c6000c4c47f7f3f21a4d9b0e1051c8a5580e07bc6106afd		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x28E47 177792 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.72, consistent with packed or encrypted content.
font_00_type1_off00022294.bin
d129a586d7449f3004ab2629e1b01753002037f8ca955d68339aba6fea13d9dd		 pdf-font-stream PDF embedded font (type1) at offset 0x22294 6428 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.55, consistent with packed or encrypted content.
font_01_type1_off00023b2f.bin
6d68a200ddadd677e7031f9795a017ce42b4d7f02b68d39a072ecbc1e20fb5d6		 pdf-font-stream PDF embedded font (type1) at offset 0x23B2F 7849 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.64, consistent with packed or encrypted content.
font_02_type1_off000259fb.bin
cab7a46a0f2b73639fc37aa221b515da6888b096748ee89dec2f4876e25f7f1f		 pdf-font-stream PDF embedded font (type1) at offset 0x259FB 2374 bytes
font_03_type1_off000261ec.bin
f1d06dc0327817e03d778a88f65436557134c269106fbc5438dd4ef0c897a441		 pdf-font-stream PDF embedded font (type1) at offset 0x261EC 11287 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.76, consistent with packed or encrypted content.

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