Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa670c87e4887f9b…

MALICIOUS

PDF

132.7 KB Created: 2010-06-11 11:09:09 +08:00 Authoring application: xyghPDF SDK 4.3 (via BCL easyPDF 4.30 (0615))
MD5: cf3ff1dc34b13ad3c25722afc2fd8ce0 SHA-1: fb698c229fc579f21140cbfdf17163975cd03094 SHA-256: fa670c87e4887f9b3397b94bbb61232fa6249e1cde9a0974a7e966dcc346b81d
228 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File T1059.001 PowerShell T1059.003 Windows Command Shell

The PDF contains embedded JavaScript and a RichMedia (Flash) object, indicating an attempt to exploit vulnerabilities. Static analysis detected multiple PDF-specific issues including XREF offset mismatches and dangling indirect objects, along with a critical ClamAV detection for 'Pdf.Exploit.Agent-35955'. The presence of an embedded secondary PDF further suggests a multi-stage attack designed to download and execute a payload.

Heuristics 10

  • 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
  • RichMedia (Flash) high PDF_RICHMEDIA
    PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector (matched inside decoded stream)
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • 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. (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)
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload (matched inside decoded stream)
  • PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE
    PDF has 1 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.
  • 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://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/xap/1.0/mm/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00000372.bin
4c0709d24392a0211d8b63b78be4a4730c0122f3852fda761b5d2e6ebcf7b11a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x372 3386 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
objstm_0015_00.bin
cbd11d2ce487f41cb2e696adc35306d2f3d38b7de6eab25b0e0d07f05d693f12		 pdf-objstm-decoded PDF /ObjStm 15 0 obj (inflated) 912 bytes
polyglot_child_pdf_off0001f79b.pdf
4044524e0d63e7a8080f48c5c2ac2d90f174bca6a94b7529f245da6d43f70bcf		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x1F79B 6976 bytes
polyglot_child_pdf_off0001faee.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x1FAEE 6125 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.