Malicious PDF — malware analysis report

Static analysis result for SHA-256 425707797d9c7aeb…

MALICIOUS

PDF

1.07 MB Created: 2005-10-16 18:18:38 UTC Authoring application: Photoshop_Album
MD5: 88d0d509fa25846d7960489b142c4723 SHA-1: 7820cb327a51fda8b0270f2c43b8c76eab0485b3 SHA-256: 425707797d9c7aeb88309cf03bf1fba8018fd017b5bd9e7ad9c2b556e74f6017
104 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EMBEDDED_SCRIPT_PAYLOAD. The presence of an eval() call and String.fromCharCode suggests obfuscation, common in malware delivery. The embedded JavaScript stream 'javascript_obj0072_007.js' and the embedded file 'embedded_file_obj0198.bin' are suspicious artifacts. The primary attack vector appears to be the execution of this embedded script, which likely downloads and executes a secondary payload.

Heuristics 10

  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution
  • 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.
  • 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
  • String.fromCharCode low PDF_FROMCHARCODE
    String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules.
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/xlink
    • http://www.adobe.com/jupiter/template
    • http://ns.adobe.com/AdobeSVGViewerExtensions/4.0/
    • http://www.w3.org/2000/svg
    • http://ns.adobe.com/Extensibility/1.0/
    • http://ns.adobe.com/AdobeIllustrator/10.0/
    • http://www.adobe.com/imageviewer)/Next
    • http://www.adobe.com/aboutpsalbumstarteredition)/Next
    • http://www.adobe.com/albumreader)/Next
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/iX/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/pdfx/1.3/
    • http://ns.adobe.com/xap/1.0/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0198.bin
de276b4c0f147384f61668d6fa9b661b80e0be6b1772e2b9fa1df6d3ef5cc1ec		 pdf-embedded-file PDF EmbeddedFile object 198 at offset 0xC19CF 74645 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 10 eval/decoder/string-building token(s).
javascript_obj0072_007.js
f8ef409b17a27f958c5539c10be9e1bfe3020f1bb7dd16eea0f5708ef3581c58		 pdf-javascript-stream PDF /JS object 72 at offset 0xD40B8 3404 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
stream_000_off000d5065.bin
1cb4db5274d278ec195164cd093a737af90c3cbb6557b53d9464102f29828ade		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD5065 1295676 bytes

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