PDF malware analysis — malicious · aa9ca9c7aa9cffba

MALICIOUS

PDF

138.1 KB

MD5: f3eb5b07d122490821db71b7c483c9c3 SHA-1: 2dd2718ed89c627af866d6cddfc059e38b8a031c SHA-256: aa9ca9c7aa9cffbae433dd204fd0af3d80d12b3cf0beda9b1a9c42b2ed62537b

388 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1071.001 Web Protocols

This PDF file is malicious, as indicated by critical heuristic firings for CVE-2011-2462 U3D heap spray and ClamAV detection as Pdf.Dropper.Agent-1506699. The embedded JavaScript stream, identified as javascript_obj0015_000.js, likely facilitates the exploit by performing a heap spray. This exploit targets a known vulnerability in Adobe Reader's U3D parser, suggesting the primary goal is to download and execute a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 14

Adobe Reader U3D parser exploit with JavaScript heap spray critical CVE likely CVE_2011_2462_U3D_HEAPSPRAY

PDF combines U3D/3D annotation content with JavaScript heap-spray shellcode. Public CVE-2011-2462 exploit chains use a crafted U3D stream and JavaScript heap spray to control memory during Adobe Reader's U3D parser corruption.
CCITTFaxDecode + TIFF/XFA exploit prep — LibTIFF CVE-family indicator high CVE related PDF_CCITT_CVE_2010_0188_RELATED

PDF uses /CCITTFaxDecode together with TIFF/XFA exploit-preparation markers such as rawValue image-field assignment, TIFF data, or heap-spray JavaScript. This matches the delivery pattern for Adobe Reader LibTIFF/CCITTFax parser exploit families, including CVE-2010-0188, but does not prove the exact malformed TIFF primitive.
U3D/3D content in PDF — Adobe Reader 3D parser CVE-family indicator high CVE related PDF_U3D_CVE_RELATED

PDF contains U3D (Universal 3D) or 3D annotation content — CVE-2011-2462 and CVE-2009-3953 are critical vulnerabilities in Adobe Reader's U3D processing that allow arbitrary code execution. U3D content in PDFs is extremely rare in normal documents.
Embedded PDF child has suspicious static findings critical PDF_EMBEDDED_CHILD_STATIC_TRIAGE

PDF contains an embedded PDF stream whose extracted child matches suspicious or malicious PDF heuristics. Wrapper PDFs are commonly used to hide the actual exploit or lure payload from scanners that do not recursively inspect attachments.
ClamAV: Pdf.Dropper.Agent-1506699 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-1506699
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
Encrypted PDF (string and stream contents are opaque to static scan) info PDF_ENCRYPTED

PDF declares /Encrypt — string objects and stream contents are encrypted with the standard security handler (RC4 or AES). On its own this is informational; legitimate encrypted documents include signed contracts, billing statements, and rights-managed material. Static heuristics cannot inspect encrypted payload bytes.
PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE

PDF has 1 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`home_tone_Desktop_Certificado_de_Correo_Nacional.pdf` `3ec1490736d02e2fb3f3541837da9ac4774d86f05f746396806c67748dcf19bd`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0x1788	142188 bytes
`javascript_obj0015_000.js` `5976a893f95a64a4437aa101729a3acd7dbc03b883f0763ec29a6527400b47f1`	pdf-javascript-stream	PDF /JS object 15 at offset 0x8D9	3702 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`u3d_00_off000004a4.bin` `db47f9e6c2fa22cca9aaaaba842bc1035f54c0acd3737dbd64b69dc1671da5eb`	pdf-3d-stream	PDF U3D 3D stream at offset 0x4A4	1268 bytes

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