PDF malware analysis — malicious · 4f3570f107e3c2a0

MALICIOUS

PDF

4.1 KB

MD5: 0313f73861c5cc0d2282c38e24553d79 SHA-1: c6c249d62e5c5b51280c619360508ab68f5d60b6 SHA-256: 4f3570f107e3c2a0910889011f3e7611c12a405a7cab9ca2d48ce48e3d2e5e95

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript streams, with one stream exhibiting `eval()` calls and `String.fromCharCode` usage, indicating obfuscated code execution. The presence of two extracted JavaScript files, 'acroform_b64_00.js' and 'javascript_obj0013_001.js', further supports the analysis of embedded scripts. The high heuristic score for `PDF_EVAL` suggests the script is designed to download and execute a secondary payload. The exact nature of the payload cannot be determined without further dynamic analysis.

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` `70783f3e6d2cb52aa293017f1384312fbdf4e430983d2367a7b6cc7b1ef43d87`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6425 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` `e59c41ed4180fd63a922fa0c97fbbc3af1a2852df453e1ca21b82b59ddbf708d`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3666 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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