Malicious PDF — malware analysis report

Static analysis result for SHA-256 36172270128b861a…

MALICIOUS

PDF

1.61 MB Created: 2008-04-15 04:26:14 +04:00
MD5: 738fe9ff987655665323ae7607b7f7a8 SHA-1: c9a23843fa4a7801613a87b73ace864753be87e8 SHA-256: 36172270128b861a4a04e83d24f65b1e262ba1de7bf552a3cf45b50a406b8780
88 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1140 Deobfuscate/Decode Files or Information

This PDF file exhibits multiple high-confidence heuristics indicating malicious intent, including the presence of JavaScript, an embedded file, and an eval() call. The embedded JavaScript is obfuscated, making its exact function difficult to determine, but the use of eval() and String.fromCharCode() strongly suggests it's designed to download and execute a secondary payload. The embedded file 'embedded_file_obj0008.bin' is likely this payload. The PDF itself appears to be an image-only lure, a common tactic for social engineering.

Heuristics 8

  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  • 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 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. (matched inside decoded stream)
  • PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE
    PDF has 2 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.
  • 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://ns.adobe.com/xap/1.0/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/iX/1.0/
    • http://ns.adobe.com/exif/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/photoshop/1.0/
    • http://ns.adobe.com/tiff/1.0/
    • http://ns.adobe.com/xap/1.0/g/img/
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#
    • 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
embedded_file_obj0008.bin
8eeeb18670b9ffb42e3bafbfe35208ebc6f7f94aaa4891dc0c2696b0b749cf88		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0x197DE0 51540 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 10 eval/decoder/string-building token(s).

Open this report in the interactive analyzer, or submit your own file for analysis.