PDF malware analysis — malicious · 5c7b5ffbe5d7dcd5

MALICIOUS

PDF

70.0 KB Created: 2010-03-17 06:18:34 Authoring application: t0nFqqbj (via DOVjWs)

MD5: 859fda550ccdc767c75d1a3e802937aa SHA-1: 13653136db3384cb1acec238e0942c4a9d3d212d SHA-256: 5c7b5ffbe5d7dcd56a5b471492920646ee88d29dd09d1574db713a4254f39cf5

156 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript that utilizes `eval()` and `fromCharCode()` functions, indicating an attempt to obfuscate malicious code. This JavaScript is highly likely to be an exploit that downloads and executes a second-stage payload. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion of an exploit.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 6

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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape 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_obj0007_000.js` `2e998f4b46a015f6fd9fd83d134dd0772c3155a819f03d7da5607cb087d124cd`	pdf-javascript-stream	PDF /JS object 7 at offset 0x237	70517 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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