Malicious PDF — malware analysis report

Static analysis result for SHA-256 86712feaff3f99bf…

MALICIOUS

PDF

950 B First seen: 2026-05-11
MD5: a796b1c1cf1e7bb1f4966f542a0c1c85 SHA-1: 8728cc8cdabc028d5463bc341bac1ca7253f4dd8 SHA-256: 86712feaff3f99bf6e914ee97e25370e26e7b1eac15d1eb2ad91c6d6faf05bc3
148 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS_EXPLOIT_CLUSTER. The presence of an eval() call within the JavaScript stream indicates an attempt to dynamically execute code, likely to exploit a known PDF vulnerability for client execution. No specific IOCs like URLs or file paths were extracted from the script content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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
    eval("app.alert('lolllle');")
  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0012_001.js pdf-javascript-stream PDF /JS object 12 at offset 0x26D 329 bytes
SHA-256: d8b3cbfd4c0b298d9cfa4e3700f8f176232b25f98bb6230683c1ffc33b8e4545
Preview script
First 1,000 lines of the extracted script
app.alert('baaaaa');
endstream
endobj
xref
0 7
0000000000 65535 f
0000000017 00000 n
0000000101 00000 n
0000000165 00000 n
0000000209 00000 n
0000000287 00000 n
0000000339 00000 n
trailer
<<
/Root 1 0 R
/ID [<2B8AC9FAB69B320551A0B85B882985F7> <2B8AC9FAB69B320551A0B85B882985F7>]
/Size 7
>>
startxref
428
%%EOF

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