Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bf3bef25eb94e1c…

MALICIOUS

PDF

372.5 KB Created: 2005-10-15 18:24:04 UTC Authoring application: Photoshop_Album
MD5: 5c4c17545b035adac111cf0aef4afda6 SHA-1: c57de21009fcb9ff237c617109d32498ba5a128a SHA-256: 0bf3bef25eb94e1cbfc933e517de61812f39d058a91ecee24cbf2258771673a3
204 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF sample contains multiple JavaScript streams and triggers heuristic firings related to PDF JavaScript exploits, including eval() calls and string manipulation. The presence of embedded files and scripts, combined with the ML classifier's high confidence, indicates a malicious intent to execute code. The JavaScript appears to be designed to manage UI elements and potentially download further content, though the exact payload mechanism is obfuscated.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 12

  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.com/imageviewer
    • http://www.adobe.com/aboutpsalbumstarteredition
    • http://www.adobe.com/albumreader
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0086.bin
a991c54d2a9907cdb671a1503462f812e5d1b8c7f2c37bb9644433ace8097b9a		 pdf-embedded-file PDF EmbeddedFile object 86 at offset 0x13FF1 51541 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 0x20B3A 3404 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
javascript_obj0072_008.js
a09402f2d9fc2f72bf8bbfee9892fc50fcaf50094cd66f6acd4925e22303fe8f		 pdf-javascript-stream PDF /JS object 72 at offset 0x20B62 247432 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
stream_000_off00021ae7.bin
1cb4db5274d278ec195164cd093a737af90c3cbb6557b53d9464102f29828ade		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x21AE7 1295676 bytes

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