PDF malware analysis — malicious · 42e99bd88b687aa5

MALICIOUS

PDF

6.9 KB First seen: 2026-05-10

MD5: 80a2b97d3a930fb3015090d2063dfc6e SHA-1: 4475574684021dce60d4732e2ece8f4b69c1d00c SHA-256: 42e99bd88b687aa57230fe483175522bec5e6cb857bc9b1b86d7ac5aac534f62

150 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings related to PDF JavaScript actions and embedded JS streams. The presence of an 'unescape()' call suggests obfuscation, and a suspicious extracted artifact was noted. While no specific malicious URLs were extracted, the JavaScript's presence and obfuscation strongly suggest it's designed to perform malicious actions, such as downloading a second-stage payload or exploiting a vulnerability. The lack of a document body makes it difficult to determine the exact lure, but the technical indicators point to a malicious script execution.

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	2099 bytes
SHA-256: `623675c10f214d88e2bd20eabed2e21b8ce721ff773f4c9473f19e949346dd8d`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 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: `873b7dd8379063807489739f20286c3cf88fc5c12d0e4164ddd2cbd8c70bf206`

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