PDF malware analysis — malicious · bf9015bda47cf31c

MALICIOUS

PDF

535.1 KB

MD5: ae9afc1e5b54d97754e90c609b4e4193 SHA-1: 1c94f68df736a1385c5182c28eb89eb2f22d0765 SHA-256: bf9015bda47cf31c0bf93842e31faf2a49bd27070d490f578f6c60b0f55bf41d

62 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains multiple embedded JavaScript streams, with one significantly large deobfuscated JavaScript file. Heuristics indicate the presence of JavaScript actions, embedded JS streams, and the use of String.fromCharCode, suggesting obfuscation techniques. The primary function of the embedded JavaScript appears to be downloading and executing a second-stage payload from a remote source, indicated by the 'Long encoded blob, Script obfuscation indicators' heuristic. The PDF structure also shows XFA form elements and AcroForm buttons, which can be leveraged to trigger JavaScript execution.

Heuristics 7

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.
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
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.
AcroForm button with action trigger low PDF_ACROFORM_BUTTON

PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
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 9

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0029_000.js` `80d7888ecf9ad9e4d03cd8cc6959f589c8f8783f37d48bb4d7dae53f6684c595`	pdf-javascript-stream	PDF /JS object 29 at offset 0x1E2A	8603 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`stream_002_off00000a8f.js` `672d461752be4a970c8e9721164ce074d252b55d09d46cc09259d2ce4fc09f7f`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xA8F	1546 bytes
`stream_003_off00000d4c.bin` `29cf1edfedd4f27f3c450646c5dc2510e6bf9e63eee1cd436ac517a465a2e1bf`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xD4C	1650 bytes
`stream_004_off000010bc.bin` `0f910ffeec733940f6ba1ae41dc6770eab5d615c05bccc95197878b62c8dc45f`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x10BC	2928 bytes
`stream_006_off00001651.bin` `4a60a9864cdf7382475d51051a03fdc43b32c31eb508893ccfccece34957f9f1`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1651	56 bytes
`stream_007_off000016d9.bin` `fe122a09d8a0444608fdc5a6f4981a2dbd469f5bbfacb4bdd327c28ccc343e13`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x16D9	149 bytes
`deobfuscated.js` `23ad59ae1660287ea3ed209afa08166d54ef76da5aa929ca38912d6e9ba94d35`	deobfuscated-js	PDF JavaScript deobfuscation pass	1468354 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 8 long base64-like blob(s).
`font_00_cff_off00004aaf.bin` `ea8f409c7366ed46eeb553aa7b404f04641f482ba88463fbe253da60be5787e5`	pdf-font-stream	PDF embedded font (cff) at offset 0x4AAF	1138 bytes
`font_01_sfnt_off000054a2.bin` `e31f8c8507e52f29008d946a00becde9f839e34cb108985ce66167bf881adafa`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x54A2	8084 bytes

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