Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea1dc1c36805dfb5…

MALICIOUS

PDF

901.6 KB Created: 2010-06-10 23:08:24 Authoring application: Advanced PDF Repair at http://www.datanumen.com/apdfr/
MD5: f08010daf3c3e8897c7eee6dd42d1002 SHA-1: 913a0c8b892888bb49297aba42c55461c53c59fb SHA-256: ea1dc1c36805dfb55bbfcf70e5c31cde3c2ebc83a391667110bc0691f5a538bf
298 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by multiple engines, including ClamAV and an ML classifier. It contains embedded JavaScript and a Flash object (pad.swf), indicating an attempt to execute arbitrary code or exploit vulnerabilities. An additional embedded PDF (polyglot_child_pdf_off000d5932.pdf) was also found to be suspicious. The presence of these elements suggests the document is designed to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 11

  • 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: Pdf.Exploit.Agent-35955 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-35955
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • RichMedia (Flash) high PDF_RICHMEDIA
    PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
  • 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.
  • 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.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE
    PDF has 2 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSEOF. 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.datanumen.com/apdfr/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
pad.swf
c8a20e8ded0e5fe8a6a5cddff2408ac7f8a83df3f18abea5748cc817f3a3ebb9		 pdf-embedded-file PDF EmbeddedFile object 27 at offset 0x4D9A 26810 bytes
Detection
ClamAV: Pdf.Exploit.Agent-35955
Obfuscation or payload: likely
Carved artifact entropy is 7.99, consistent with packed or encrypted content.
polyglot_child_pdf_off000d5932.pdf
c491e9ed61bfe2a2b7350ef98ea3cd73c2191b6f9c7874cb0e87eb4bba0d4e1b		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0xD5932 48422 bytes
Detection
ClamAV: Pdf.Exploit.Agent-35955
Obfuscation or payload: likely
Carved artifact contains 1 long hex-escaped blob(s).

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