Malicious PDF — malware analysis report

Static analysis result for SHA-256 237c87f552b2225d…

MALICIOUS

PDF

80.9 KB Created: 2010-03-31 10:11:42 UTC Authoring application: Advanced PDF Repair: http://www.pdf-repair.com
MD5: 4f937868113b152a232012282cea7170 SHA-1: 7d6917030e059ffc6dcb78e206c9af7fdac1fd84 SHA-256: 237c87f552b2225d51ec1e9fe13e54d0a49f2ea5e422a947970f8c8f10ac4b90
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File T1059.001 PowerShell

The PDF file contains embedded content and scripts, as indicated by the PDF_EMBEDDED and PDF_EMBEDDED_SCRIPT_PAYLOAD heuristics. ClamAV also flagged it as Heuristics.PDF.ObfuscatedNameObject, suggesting malicious intent. The embedded file 'embedded_file_obj0001.bin' is a strong indicator of a potential payload delivery. The presence of embedded URLs, though mostly benign, includes a reference to 'www.pdf-repair.com' which could be part of a lure.

Heuristics 7

  • ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
  • 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 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
  • 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.
  • 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.pdf-repair.com
    • http://www.pdf-repair.com)/Producer(Advanced
    • http://www.pdf-repair.com)/ModDate(D:20100406171120+08
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0001.bin
cbd31ccce271daa4bd5150e2213ec80b68b481e51470fcc6b5a28ee2541d44c0		 pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x53 13431 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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