PDF malware analysis — malicious · ba8d9a9e874e20fa

MALICIOUS

PDF

4.1 KB

MD5: 28a42fab6553cb90129cdb98046aff75 SHA-1: 987f2e5f81fe77aa57bc026fbda4bcb6a13842a4 SHA-256: ba8d9a9e874e20fa4c18565228b4ee943daa0117f300117a7efc60addda628f4

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The `eval()` call and `String.fromCharCode` usage within the decoded stream suggest obfuscation. The extracted JavaScript files, `acroform_b64_00.js` and `javascript_obj0013_001.js`, are likely responsible for downloading and executing a secondary payload. The exact nature of the payload cannot be determined from the provided evidence.

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` `3aa584ea32e331be2c8dbc71e5207c55c340b7ca0f21b3b36f4e1eb124ccee34`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6385 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` `ad44d91abee501d21c26c71e2fc259f1fee41f3ec2a31f9e6110d95168267177`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3636 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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