PDF malware analysis — malicious · 3fd64cf10aaf65f4

MALICIOUS

PDF

4.1 KB

MD5: 85c337d1abf3695832220d578d05a480 SHA-1: 0fa9bb37302e4c5ffb656fe8ebc65601140285d2 SHA-256: 3fd64cf10aaf65f4e9fbe6c9dfa28ac21695cc51f6df33cfd428a0cf9a38bddd

68 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

This PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream exhibits obfuscation, including the use of eval() and String.fromCharCode(), suggesting malicious intent. The primary function of the embedded script appears to be downloading and executing a secondary payload. The differential parser failure is noted but does not invalidate the findings from static heuristics.

Heuristics 6

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)
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSEOF. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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` `33d1398be8b8a2412757040483ab7794f8707582ad54a43805e93d9e97a058d2`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6405 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` `dff868934abed9d9713ad3d7dc236cb63a90b4936c57dfd68c5b113ad40a1c20`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3649 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

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