PDF malware analysis — malicious · 38f80d325827c0ad

MALICIOUS

PDF

6.7 KB First seen: 2026-05-10

MD5: 31a49aa352237a09ea083af3ed0c689e SHA-1: 96fe912c404996743e410ba93a48dd37955775b6 SHA-256: 38f80d325827c0adc05b18d7c630bf4d559ee6a5c369077210a3e868882711bf

150 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/Shell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream was found to contain an unescape() call, suggesting obfuscation. While no specific malicious URLs or commands were directly extracted, the presence of obfuscated JavaScript strongly suggests an attempt to download and execute a secondary payload or perform other malicious actions upon opening the document. The benign URLs present do not indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9833

Heuristics 5

JavaScript action low 2 related findings PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules. (matched inside decoded stream)
PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
Matched line in script
```
RandomVar1=unescape(RandomVar1);
```
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. (matched inside decoded stream)
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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://www.w3.org/1999/02/22-rdf-syntax-ns# In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_002_off00000327.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x327	1393 bytes
SHA-256: `6fa5a87a3e18f3314df91b9f221d8e90ea8ac09cc5702022cd0c597399c3ea71`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`objstm_0024_00.bin`	pdf-objstm-decoded	PDF /ObjStm 24 0 obj (inflated)	331 bytes
SHA-256: `75ac18fdb75d81ab02ebc12849f7369afdb7ebb50cdded86981c189bbb15abf3`

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