PDF malware analysis — malicious · f7f1a1521bd55dcb

MALICIOUS

PDF

871 B

MD5: 69eced2471295b6fa23d671c8e289d37 SHA-1: d840a6374cad79ef0972b1820bb8c04554b131e7 SHA-256: f7f1a1521bd55dcb044a2becde74a9ddfd74e09faf0ebf2632811d8460a198fd

66 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Phishing: Spearphishing Attachment T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings related to PDF and JavaScript. The JavaScript stream appears to be obfuscated using unescape() and String.fromCharCode, suggesting an attempt to hide its malicious functionality. The primary purpose seems to be the execution of this script, which is likely responsible for downloading and executing a second-stage payload or performing other malicious actions.

Heuristics 5

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `2b3796acc2814b15ed58148953cddfb21cccef83b32c14ae8fdd7c1a3844e81c`	pdf-javascript-stream	PDF /JS object 5 at offset 0x156	409 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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