Malicious PDF — malware analysis report

Static analysis result for SHA-256 697475c6127108c6…

MALICIOUS

PDF

537.8 KB Created: 2010-03-06 14:49:02 -01:00 Authoring application: Photoshop_Album
MD5: 2680bd3130d7bfb2cba300579dd6d1c5 SHA-1: 749d70ff8af685bdceccb38bacda4012a8fe0b64 SHA-256: 697475c6127108c64bf3e88355f3e553e3288380e88b9816138630e00628875b
236 Risk Score

Malware Insights

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

This PDF file exhibits multiple high-severity heuristic firings related to JavaScript exploits, including eval() calls and the PDF JavaScript exploit cluster. The embedded JavaScript streams, particularly javascript_obj0072_008.js, are large and likely contain obfuscated code designed to exploit vulnerabilities. The presence of an embedded file and the ML classifier's high confidence score further indicate malicious intent, likely to download and execute a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 12

  • PRC/3D content in PDF high CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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
  • 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.fr/aboutpsalbumstarteredition
    • http://www.adobe.fr/aboutpsalbumstarteredition)/Next
    • http://www.adobe.com/imageviewer
    • http://www.adobe.com/albumreader
    • http://ns.adobe.com/xap/1.0/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/tiff/1.0/
    • http://ns.adobe.com/exif/1.0/
    • http://www.iec.ch
    • 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/albumreader)/Next
    • http://ns.adobe.com/iX/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/pdfx/1.3/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0121.bin
ea59a2fb9936ec0f86293c087dcab186c6f7e2afbac73379941d2cf0f3d44e86		 pdf-embedded-file PDF EmbeddedFile object 121 at offset 0x3B759 58284 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 0x49DAD 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
0a3a8f75bf91bc5a7fbea5389b1f42ad35356aabf7e68bc57b9d6b46334916f9		 pdf-javascript-stream PDF /JS object 72 at offset 0x49DD5 248174 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
stream_000_off0004ad5a.bin
1cb4db5274d278ec195164cd093a737af90c3cbb6557b53d9464102f29828ade		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AD5A 1295676 bytes

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