PDF malware analysis — malicious · bb538d0b517a148a

MALICIOUS

PDF

8.9 KB

MD5: 50a55651924ebceea1f4a217e49e8ea5 SHA-1: 4ccfee1052c02687af8479b4577515ed35fabec8 SHA-256: bb538d0b517a148a0b444fda58741a5522fe4c7ccb265a723f2f616a4ca9ff19

82 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_EVAL and PDF_FROMCHARCODE firings suggest obfuscated JavaScript code is present within a decoded stream. This script is likely designed to download and execute a secondary payload. The document body text, 'Annual Financial Report For your eyes only', is a common lure for phishing or social engineering attacks.

Heuristics 7

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.
Additional-actions dictionary low PDF_AA

PDF defines /AA (Additional Actions) that references an executable action (JS/JavaScript/Launch/SubmitForm) — can auto-trigger on document or widget events. Form-field calc/format/validate/keystroke handlers in legitimate interactive forms commonly fire this, so it is reported as a low-weight signal; weaponised auto-execution is flagged by stronger rules (PDF_OPENACTION, encrypted-with-JS, etc.)
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)
ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85

ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
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` `3b7505253e5b0e8eecf1d4798a650c4c1d0ad2e01cd5bba214843d3fa9a6c3b3`	pdf-javascript-stream	PDF /JS object 5 at offset 0x263	9860 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 8 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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