Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec5cdf02f61cb720…

MALICIOUS

PDF

42.8 KB Created: 2008-03-03 17:06:20 +08:00 Authoring application: Advanced PDF Repair: http://www.pdf-repair.com
MD5: 944076c6df8c60b3795882fe306bde0e SHA-1: 89696239c3edea110c75cb6d6ea4cc38324b8c6d SHA-256: ec5cdf02f61cb720ceb7b89615107df16772f24f58a583f00fa503bdbfff21f9
134 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript with an eval() call, indicating obfuscated malicious code execution. ClamAV detected this as Heuristics.PDF.ObfuscatedNameObject. The embedded JavaScript stream is likely responsible for downloading and executing a second-stage payload. The presence of multiple unknown URLs associated with 'pdf-repair.com' suggests a potential lure or command and control infrastructure.

Heuristics 8

  • ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (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.
  • 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
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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/xhtml
    • http://www.xfa.org/schema/xfa-data/1.0/
    • 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
javascript_obj0038_000.js
d09b3f8531bbd0b9fb1a15b94dac709f7710e3e969ad94204049ce689fed2ee0		 pdf-javascript-stream PDF /JS object 38 at offset 0x151F 18155 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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