Malicious PDF — malware analysis report

Static analysis result for SHA-256 958fd79d5f213e81…

MALICIOUS

PDF

68.4 KB Created: 2010-05-07 17:49:21 +02:00 First seen: 2026-05-10
MD5: 5f7f5c53fa0b3e181ecfdc336b45b9d0 SHA-1: e8e437cddfd0d9f6b6baa08d5781524bdbee869d SHA-256: 958fd79d5f213e81bcefda4a982b6c2fd7e5743c83faf132b537439d37bf3c96
158 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.002 Spearphishing Attachment T1071.001 Web Protocols

The PDF file contains embedded JavaScript that triggers a SubmitForm action, which in turn attempts to navigate to a Google search URL. This suggests a potential redirection or download mechanism. The presence of embedded JavaScript and a SubmitForm action are indicative of malicious intent, possibly to lure the user to a malicious site or to download a second-stage payload. The extracted JavaScript file is also flagged as suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6341

Heuristics 8

  • Embedded Windows executable payload in PDF stream critical PDF_EMBEDDED_PE_PAYLOAD
    PDF stream bytes contain an embedded Windows executable with a verified PE header. Exploit chains often hide droppers inside ordinary streams rather than standard /EmbeddedFile attachments.
  • SubmitForm action medium PDF_SUBMITFORM
    PDF has a /SubmitForm action — form data can be silently posted to an attacker-controlled URL (matched inside decoded stream)
  • Suspicious extracted artifact medium 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 file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • JavaScript action low 1 related finding 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)
  • 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://localhost/test.zip In PDF document text
    • http://www.google.com/[5/7/2010In PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://www.google.com/search?q=Tchaikovsky&ct=tchaikovsky10-hp&oi=ddleReferenced by PDF JavaScript
    • http://www.google.com/search)/FS/URLReferenced by PDF JavaScript

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
downloader.bin pdf-embedded-file PDF EmbeddedFile object 96 at offset 0x10DE3 2560 bytes
SHA-256: 65d498e68ac518bbe49416b77840308aaa28fd86b39ab7706314f94f815d999e
Detection
ClamAV: No threats found
Obfuscation or payload: likely
actual_type=PE; declared_or_context_type=PDF; filename=downloader.bin; kind=pdf-embedded-file
stream_000_off0000005f.js decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5F 7109 bytes
SHA-256: 59bd7d034efc9caeeff55702df9cb2e409eeb637c1926b388fcb99f3fde8855f
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 long base64-like blob(s).

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