PDF malware analysis — malicious · b8374c04c58fa045

MALICIOUS

PDF

16.1 KB Created: 2009-09-25 19:43:64 Authoring application: PDF Library 4.10.10 (via PDF Library 9.7.9)

MD5: 8ae18bcc2a93a66e9e4d583b8d9ed673 SHA-1: 321420d3ba9b8f259a3e378fd4c2849723529e69 SHA-256: b8374c04c58fa045ea892a6f49cee7bcd473e4e8436e6c58b24bbe6381ef9cf8

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains obfuscated JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, PDF_EVAL, and PDF_FROMCHARCODE. The `eval()` call and `String.fromCharCode` are commonly used to deobfuscate and execute malicious code. The embedded JavaScript file `javascript_obj0007_000.js` is the primary artifact. While the exact payload is not clear due to obfuscation, the techniques suggest the script is designed to download and execute a second-stage payload.

Heuristics 7

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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: PSSyntaxError. 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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `55c51c17359f515fde9dd0a77cdce7e0aab592479804568a92ca4dd7379cf02a`	pdf-javascript-stream	PDF /JS object 7 at offset 0x268	170356 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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