PDF malware analysis — malicious · bb951949ec18c920

MALICIOUS

PDF

7.0 KB First seen: 2026-05-11

MD5: b5f911b36fb8f856947a22fa3111e8bd SHA-1: b9e145b2cd2d6a45ef0ea7fa17d4b2d94b0af1c8 SHA-256: bb951949ec18c9203e9febe342c8e5daf13a933a1742700ec38a706ca3b44c20

150 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The JavaScript stream utilizes the unescape() function, a common technique for obfuscation in malicious scripts. While no specific malicious URLs or further script content were extracted, the presence of obfuscated JavaScript strongly suggests an attempt to execute a malicious payload, likely for downloading and running a second-stage exploit or malware. The benign URLs present do not detract from this assessment.

Machine Learning

Nyx PDF Classifier malicious score 0.9825

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	2316 bytes
SHA-256: `1e89a5bf056066e1389443d28740430d377b3946aef410ef80943227b2ef5b04`
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).
`stream_003_off0000081a.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x81A	442 bytes
SHA-256: `c80cef4e09dc055c4e99ae1e65e9d8c3d52b80835260c4708e548ba1583aa907`

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