Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc6dcdf0ed87a546…

MALICIOUS

PDF

80.9 KB Created: 2010-03-31 10:11:42 UTC Authoring application: Advanced PDF Repair: http://www.pdf-repair.com
MD5: 290294562315b77f16a378c6b022d22a SHA-1: dd4a197c4b9e0604badcf4218b0def38cef4e7f2 SHA-256: bc6dcdf0ed87a546eb2b8681f83b144987f154d5009429311770597f48a7f94f
74 Risk Score

Malware Insights

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

The PDF contains an embedded file, flagged by heuristics as a potential script payload. The ML classifier strongly indicates maliciousness. The embedded file, named 'embedded_file_obj0001.bin', is likely intended to be downloaded and executed by the user, serving as the primary attack vector. The presence of the 'pdf-repair.com' URL, though not directly malicious, is associated with the document's metadata.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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
374649ca9d248b513cf7adf1fbdefc499c0f5cf754334845fe32496ec9c2fa44		 pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x51 13412 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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