Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1485bb5fde0a1dd…

MALICIOUS

PDF

321.5 KB Created: 2010-05-19 16:38:39 -01:00 Authoring application: Photoshop_Album
MD5: 8dd1ea1f44660b5516120c8ce0c4acf2 SHA-1: eb950e48f1b78256a65c3f217af58357c73f58a3 SHA-256: d1485bb5fde0a1dde3602256447e814f3ee31e1f1f42e61a25e94aa37a0deeba
104 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment T1071.001 Web Protocols

The PDF file 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 techniques are used to hide malicious code. This script is likely designed to download and execute a second-stage payload from an external source. The embedded file and JavaScript stream are suspicious artifacts.

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.adobe.es/albumreader)/Next
    • 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.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_obj0079.bin
13f1420bbc6fb04f5817932d024d816e3d941c0e72823a0be18a4ac8364a7c6b		 pdf-embedded-file PDF EmbeddedFile object 79 at offset 0x7BC2 50019 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 0x140FD 3404 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
stream_000_off000150aa.bin
1cb4db5274d278ec195164cd093a737af90c3cbb6557b53d9464102f29828ade		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x150AA 1295676 bytes

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