Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ea3ca6c8fbc7322…

MALICIOUS

PDF

5.6 KB
MD5: 466b5f97359f1be53306485f7b92f11f SHA-1: 32a43e94c6a9859d5fba084851aebb676b10cf5b SHA-256: 5ea3ca6c8fbc732211d80fc995d92f59a7c86157c33134a2f9018658abf54b9d
238 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

This PDF file exhibits multiple high and critical heuristic firings related to JavaScript exploits and obfuscated objects, strongly indicating malicious intent. The presence of PDF_JS_EXPLOIT_CLUSTER and ClamAV's detection of 'Heuristics.PDF.ObfuscatedNameObject' confirms the exploitation of PDF vulnerabilities. The ML classifier also flagged this as malicious with high confidence. The attack pattern suggests it's designed to execute arbitrary code, likely by downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9470

Heuristics 9

  • 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: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
  • OpenAction trigger high PDF_OPENACTION
    PDF has an /OpenAction that launches, submits, or opens an external target
  • ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX
    Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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.xfa.org/schema/xfa-template/2.4/
    • http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0001.bin
dada564c519ce1b0d902c08a935f269fad222f1e42c3eeb43111eca2c2d1ed86		 pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x2F9 1439 bytes
stream_001_off00001117.bin
f64879c9bd49380f009d33348a76623a4a158cae4655096ce43322a8f12cb834		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1117 806 bytes
stream_003_off00001363.bin
422a5430698c54d7acba092e1350d18143964b54c5496415f1d8f31cbbcf0663		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1363 332 bytes

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