PDF malware analysis — malicious · 88e99d41b27f8bd9

MALICIOUS

PDF

580.9 KB

MD5: e3badea33e102dec57d1728a2f6b26d0 SHA-1: fc80a97a4f6cc704e444dab8ed1aeeae2f5100ea SHA-256: 88e99d41b27f8bd968c68945c870502be19b1c8c8fe9c81ba2d602e80b205a3c

308 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that is heavily obfuscated and utilizes `eval()` and `unescape()` functions, indicating malicious intent. The presence of the `Collab.collectEmailInfo` object and the `CVE_2007_5659` heuristic strongly suggests exploitation of a known vulnerability in Adobe Reader. The `CLAMAV_DETECTION` heuristic further confirms its malicious nature as Pdf.Exploit.Agent-35912. The primary attack vector appears to be leveraging a PDF vulnerability to execute arbitrary code.

Heuristics 10

Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
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.
ClamAV: Pdf.Exploit.Agent-35912 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35912
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
Annotation subject callee-key hex JavaScript stager high PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER

PDF JavaScript uses syncAnnotScan()/getAnnots() to read an indirect annotation /Subject stream, percent-decodes it through marker replacement, then uses a callee.toString()-derived key to decode and eval the final exploit stage.
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.
syncAnnotScan annotation-staging primitive low PDF_FOXIT_SYNCANNOTSCAN

PDF JavaScript calls syncAnnotScan() — a no-op annotation-enumeration primitive used by exploit-kit JavaScript to stage payload reads from annotation /Subject fields before eval(). Not a vulnerable sink itself; rarely seen in legitimate PDFs. (matched in decompressed 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 13

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0031_000.js` `7218a1c68060953321573daa035b16f5f32928ce25a9eb656690dbe78cd9464e`	pdf-javascript-stream	PDF /JS object 31 at offset 0x2BC97	201 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`annotation_subject_callee_hex_stage_000.js` `1d987cdb81bc222a3601c0e630986678b4a0bdb3f520b1cfedec1da9cabbfaa3`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x213D3	5526 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `2e32c8e02230a28730cd86e6a2e8d2c21823cce56618fb6cb052f40b332dc63e`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2802B	12910 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`deobfuscated.js` `a4df29c00c80d796678363f73ba49cf94a945734b3526461db4b9436ce0e8d47`	deobfuscated-js	PDF JavaScript deobfuscation pass	3398953 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`icc_00_off0007c7f5.icc` `2b3aa1645779a9e634744faf9b01e9102b0c9b88fd6deced7934df86b949af7e`	pdf-icc-profile	PDF ICC profile at offset 0x7C7F5	3144 bytes
`font_00_sfnt_off00000e5a.bin` `afeb9e1e920aae3aca3f295f1bbccba46b16423dac14b1b5fde4b661de9198cc`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE5A	46764 bytes
`font_01_sfnt_off00008483.bin` `5f96e1e90c4ef56487c91d02c05141dca0967f8e2bbd5d67be6c4f381f0afa79`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8483	62160 bytes
`font_02_sfnt_off00011b6b.bin` `d375c22ace40f0b973d7308d85023b2e0e49d40dc51da45552d116868346475e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B6B	37232 bytes
`font_03_sfnt_off000166cd.bin` `b661c2e877dd6b7625208ae148d736aedb24eda2d4f014262cbb7f958f538ca0`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x166CD	71216 bytes
`font_11_sfnt_off0006cddb.bin` `8b62f203a4ab5c2ac76368029c584b4fa12fffc17f3b6e4e43a9997416807d21`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6CDDB	11156 bytes
`font_12_sfnt_off0007208e.bin` `6cf6df6beee88aa138f821122d0c1969b348cebe09cafe5b5f6a7eb8c27107a0`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7208E	32640 bytes
`font_13_sfnt_off000868de.bin` `95592346b00d039686aa3d7e22eae3d52b011e7e842a5c123f73e89ea766cd35`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x868DE	22628 bytes
`u3d_00_off000214eb.bin` `70cf2aead4823e6d2651c9281eed0aa967449da358f439efb9e8e707421175e0`	pdf-3d-stream	PDF U3D 3D stream at offset 0x214EB	28021 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.79, consistent with packed or encrypted content.

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