Malicious PDF — malware analysis report

Static analysis result for SHA-256 3de9deea49e5ac26…

MALICIOUS

PDF

157.8 KB Created: 2016-04-24 12:23:12 Authoring application: convertonlinefree.com
MD5: 9b4eda68cd2f3bf10b188002c8ba9bb1 SHA-1: 4190e4e96f2123b98b74d6e57653f315b28be385 SHA-256: 3de9deea49e5ac26377bffd73dd92315fec3fbe5a006a14d99a19df136918491
282 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and is associated with CVE-2023-26369, indicating it's designed to exploit a vulnerability. The embedded script likely facilitates the download and execution of a second-stage payload from the external URI 'http://deltafirst-sa.com/wp-package/AO3dI/'. The presence of XFA heap spray and JS exploit cluster heuristics further supports this attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9062

Heuristics 8

  • 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.
  • XFA JavaScript heap-spray exploit code critical PDF_XFA_HEAP_SPRAY
    PDF contains XFA script content with heap-spray or shellcode-like JavaScript markers such as large encoded word sequences, util.pack, large arrays, or spray variable names. This is a weaponised Adobe Reader exploit pattern, not a normal interactive form.
  • 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.
  • ClamAV: Pdf.Dropper.Agent-7252500-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7252500-0
  • 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.
  • 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
  • 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://deltafirst-sa.com/wp-package/AO3dI/
    • http://mirror1.convertonlinefree.com
    • http://www.microsoft.com/downloads/en/details.aspx?FamilyID=ab99342f-5d1a-413d-8319-81da479ab0d7
    • http://go.microsoft.com/fwlink/?LinkID=149156&amp;v=4.0.50826.0
    • http://go.microsoft.com/fwlink/?LinkId=161376
    • http://www.microsoft.com/typography/ctfontshttp://fontfabrik.comYou
    • http://www.microsoft.com/typography/fonts/default.aspx
    • http://crl.microsoft.com/pki/crl/products/MicrosoftTimeStampPCA.crl0X
    • http://www.microsoft.com/pki/certs/MicrosoftTimeStampPCA.crt0
    • http://crl.microsoft.com/pki/crl/products/MicCodSigPCA_08-31-2010.crl0Z
    • http://www.microsoft.com/pki/certs/MicCodSigPCA_08-31-2010.crt0
    • http://crl.microsoft.com/pki/crl/products/microsoftrootcert.crl0T
    • http://www.microsoft.com/pki/certs/MicrosoftRootCert.crt0
    • http://www.microsoft.com/Typography/0

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000801b.bin
f3bf9704ae1a1b01d6eaba8c4203245dfddd8957cdd25f52cca46afe823164ba		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x801B 173484 bytes
embedded_pdf_script_0001bb02.bin
d12930a303295c0d210edb6e94fc67e6b84449edde6d09eedc1746a4340e2c4c		 pdf-embedded-script PDF decompressed stream script payload at offset 0x1BB02 161517 bytes

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