PDF malware analysis — malicious · f926cf631266a00b

MALICIOUS

PDF

4.0 KB

MD5: 95fd0bc4c968639f65cf6147b40b6e20 SHA-1: ae2518b65536b1e6719750c1ba3fe65929a17f33 SHA-256: f926cf631266a00babda4c448c1d27b75e054d6878f2a6ae4dffba0d0fed84e9

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream includes an eval() call and uses String.fromCharCode, suggesting obfuscation. The primary intent appears to be downloading and executing a second-stage payload, as evidenced by the deobfuscated JavaScript file 'acroform_b64_00.js'. The obfuscated nature of the script and the presence of multiple JavaScript streams lead to a high confidence in malicious intent, though the specific family remains undetermined.

Heuristics 5

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. (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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `fda14cc7891ef290260c226ba48626f8bc9c503f6890760b74e7905113588599`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6281 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `6521be36fae71b4849554dd94e731fda5e2e398dd7f84aa0a41691458cec9ab8`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3556 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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