PDF malware analysis — malicious · bbfb2077588b7e2a

MALICIOUS

PDF

6.5 KB First seen: 2026-05-10

MD5: 8f2a05025ad01582a1701df9057d1ae7 SHA-1: a3560c3370798d47c4d6fa653274c22bdc328ff5 SHA-256: bbfb2077588b7e2a8fd955f1b9e25a8bb76ba2e932c26d5c859e1e959e43fa5d

150 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript utilizes an unescape() function, a common technique for obfuscating malicious code within PDF documents. This suggests the script is designed to exploit a vulnerability and download a secondary payload. No specific family could be identified due to the generic nature of the obfuscation.

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_off00000324.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x324	1066 bytes
SHA-256: `efcd6a3cabe46ef8afd5e6d6f5b9a9eb1468e5b5d1dfff27820e1d9d0579e508`
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: `28851aa15600af5ce6bf50df2ffbd9a08a6555b9ffd010f306a7872376a00cbc`

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