PDF / .201 malware analysis — malicious · 73f0c4283051bdd0

MALICIOUS

PDF / .201

13.2 KB

MD5: bc5be9051ae9264436ee6494e153735b SHA-1: 97ff02d97af4a0a95913cbe6a98566051ced0012 SHA-256: 73f0c4283051bdd05b172613b65e3383534166820dd700dec5ed926a05f0bc2e

276 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains obfuscated JavaScript that exploits CVE-2007-5659 (Collab.collectEmailInfo) to achieve code execution. The deobfuscated JavaScript appears to download and execute a second-stage payload from a URL, indicated by the string '\x74\x70\x74\x73\x3a\x2f\x2f\x79\x72\x69\x66\x6f\x64\x66\x61\x63\x65\x2e\x6d\x6f\x6c\x2f\x61\x66\x2e\x64\x68\x70\x3f\x70\x3d\x61\x6e\x64\x72\x6f\x69\x64\x26\x78\x70\x72\x6f\x72\x65\x20\x36\x2e\x65\x26' which decodes to 'ttps://yrifodface.mol/af.dhp?p=android&xprore 6.e&'. This indicates a downloader functionality.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 8

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)
PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
Binary-XOR JavaScript stager high PDF_BINARY_XOR_JS_STAGER

PDF JavaScript stores viewer-version payload branches as long binary digit strings, XORs each bit pair, converts 8-bit chunks with String.fromCharCode, and evals the recovered 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.
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)
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0049_000.js` `a3f512dbcc064acf1eba5406911aae0dd4d10d3d0ecf9c4bbc7cb9ad33378e91`	pdf-javascript-stream	PDF /JS object 49 at offset 0xA	78556 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`binary_xor_stage_000.js` `df4392da5ae75b6a53ee5813cb8c1a374e11da6cfd2c80dec2252b2f535f3c94`	deobfuscated-js	binary-XOR decoded JavaScript at offset 0x3F8	1312 bytes

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