PDF malware analysis — malicious · 1fd683e7317a634a

MALICIOUS

PDF

4.0 KB

MD5: 22ebcae6b542ec873ba95f2058c814ee SHA-1: bd27b6c5f2c51744ef2ea2d657b80e2bc8228f42 SHA-256: 1fd683e7317a634a31d2a142f9a990bef737d0e91047d812c15e1de0fb711e4a

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of an eval() call and String.fromCharCode() within the decoded stream suggests obfuscated code execution. While the exact payload is not discernible due to obfuscation, these indicators point to a malicious script attempting to run arbitrary code. The deobfuscated JavaScript file, acroform_b64_00.js, was also identified as a suspicious artifact.

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` `1ef2da7e918e6c1915047fc1fb5b33bb33876db287dd0468e9019845fe30bb79`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6261 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` `4498322e659a31a9ac30b6b2f8e2c144650f8a21c872ed51475b24598c813566`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3541 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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